Merge pull request #651 from eiiches/fix-examples
Fix several errors in the manual
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Nico Williams committed
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-139
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@@ -1094,7 +1094,7 @@ sections:
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output: ['[{"foo": 1, "bar": 2}, {"foo": 4, "bar": 5}]']
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- program: 'unique_by(length)'
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input: '["chunky", "bacon", "kitten", "cicada", "asparagus"]'
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output: ['["chunky", "bacon", "asparagus"]']
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output: ['["bacon", "chunky", "asparagus"]']
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- title: "`reverse`"
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body: |
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@@ -1164,7 +1164,7 @@ sections:
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- program: 'index(", ")'
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input: '"a,b, cd, efg, hijk"'
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output: ['3']
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- program: 'rindex(", ")]'
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- program: 'rindex(", ")'
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input: '"a,b, cd, efg, hijk"'
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output: ['12']
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@@ -1343,6 +1343,7 @@ sections:
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- program: 'recurse'
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input: '{"a":0,"b":[1]}'
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output:
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- '{"a":0,"b":[1]}'
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- '0'
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- '[1]'
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- '1'
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@@ -1668,181 +1669,180 @@ sections:
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The jq regex filters are defined so that they can be used using
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one of these patterns:
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STRING | FILTER( REGEX )
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STRING | FILTER( REGEX; FLAGS )
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STRING | FILTER( [REGEX] )
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STRING | FILTER( [REGEX, FLAGS] )
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STRING | FILTER( REGEX )
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STRING | FILTER( REGEX; FLAGS )
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STRING | FILTER( [REGEX] )
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STRING | FILTER( [REGEX, FLAGS] )
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where:
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* STRING, REGEX and FLAGS are jq strings and subject to jq string interpolation;
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* REGEX, after string interpolation, should be a valid PCRE regex;
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* FILTER is one of `test`, `match`, or `capture`, as described below.
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where:
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* STRING, REGEX and FLAGS are jq strings and subject to jq string interpolation;
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* REGEX, after string interpolation, should be a valid PCRE regex;
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* FILTER is one of `test`, `match`, or `capture`, as described below.
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FLAGS is a string consisting of one of more of the supported flags:
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FLAGS is a string consisting of one of more of the supported flags:
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* `g` - Global search (find all matches, not just the first)
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* `i` - Case insensitive search
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* `m` - Multi line mode ('.' will match newlines)
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* `n` - Ignore empty matches
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* `p` - Both s and m modes are enabled
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* `s` - Single line mode ('^' -> '\A', '$' -> '\Z')
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* `l` - Find longest possible matches
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* `x` - Extended regex format (ignore whitespace and comments)
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* `g` - Global search (find all matches, not just the first)
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* `i` - Case insensitive search
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* `m` - Multi line mode ('.' will match newlines)
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* `n` - Ignore empty matches
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* `p` - Both s and m modes are enabled
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* `s` - Single line mode ('^' -> '\A', '$' -> '\Z')
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* `l` - Find longest possible matches
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* `x` - Extended regex format (ignore whitespace and comments)
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To match whitespace in an x pattern use an escape such as \s, e.g.
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To match whitespace in an x pattern use an escape such as \s, e.g.
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* test( "a\\sb", "x" ).
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* test( "a\\sb", "x" ).
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Note that certain flags may also be specified within REGEX, e.g.
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Note that certain flags may also be specified within REGEX, e.g.
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* jq -n '("test", "TEst", "teST", "TEST") | test( "(?i)te(?-i)st" )'
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* jq -n '("test", "TEst", "teST", "TEST") | test( "(?i)te(?-i)st" )'
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evaluates to: true, true, false, false.
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evaluates to: true, true, false, false.
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entries:
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- title: "`test(val)`, `test(regex; flags)`"
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body: |
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entries:
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- title: "`test(val)`, `test(regex; flags)`"
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body: |
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Like `match`, but does not return match objects, only `true` or `false`
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for whether or not the regex matches the input.
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Like `match`, but does not return match objects, only `true` or `false`
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for whether or not the regex matches the input.
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examples:
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- program: 'test("foo")'
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input: '"foo"'
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output: 'true'
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- program: 'test("a b c # spaces are ignored"; "ix")'
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input: '"xabcd" "ABC"'
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output: true
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true
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examples:
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- program: 'test("foo")'
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input: '"foo"'
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output: ['true']
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- program: '.[] | test("a b c # spaces are ignored"; "ix")'
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input: '["xabcd", "ABC"]'
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output: ['true', 'true']
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- title: "`match(val)`, `match(regex; flags)`"
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body: |
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- title: "`match(val)`, `match(regex; flags)`"
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body: |
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**match** outputs an object for each match it finds. Matches have
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the following fields:
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**match** outputs an object for each match it finds. Matches have
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the following fields:
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* `offset` - offset in UTF-8 codepoints from the beginning of the input
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* `length` - length in UTF-8 codepoints of the match
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* `string` - the string that it matched
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* `captures` - an array of objects representing capturing groups.
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* `offset` - offset in UTF-8 codepoints from the beginning of the input
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* `length` - length in UTF-8 codepoints of the match
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* `string` - the string that it matched
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* `captures` - an array of objects representing capturing groups.
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Capturing group objects have the following fields:
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Capturing group objects have the following fields:
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* `offset` - offset in UTF-8 codepoints from the beginning of the input
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* `length` - length in UTF-8 codepoints of this capturing group
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* `string` - the string that was captured
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* `name` - the name of the capturing group (or `null` if it was unnamed)
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* `offset` - offset in UTF-8 codepoints from the beginning of the input
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* `length` - length in UTF-8 codepoints of this capturing group
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* `string` - the string that was captured
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* `name` - the name of the capturing group (or `null` if it was unnamed)
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Capturing groups that did not match anything return an offset of -1
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Capturing groups that did not match anything return an offset of -1
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examples:
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- program: 'match("(abc)+"; "g")'
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input: '"abc abc"'
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output:
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- '{"offset": 0, "length": 3, "string": "abc", "captures": [{"offset": 0, "length": 3, "string": "abc", "name": null}]}'
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- '{"offset": 4, "length": 3, "string": "abc", "captures": [{"offset": 4, "length": 3, "string": "abc", "name": null}]}'
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- program: 'match("foo")'
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input: '"foo bar foo"'
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output: ['{"offset": 0, "length": 3, "string": "foo", "captures": []}']
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- program: 'match(["foo", "ig"])'
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input: '"foo bar FOO"'
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output:
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- '{"offset": 0, "length": 3, "string": "foo", "captures": []}'
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- '{"offset": 8, "length": 3, "string": "FOO", "captures": []}'
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- program: 'match("foo (?<bar123>bar)? foo"; "ig")'
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input: '"foo bar foo foo foo"'
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output:
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- '{"offset": 0, "length": 11, "string": "foo bar foo", "captures": [{"offset": 4, "length": 3, "string": "bar", "name": "bar123"}]}'
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- '{"offset": 12, "length": 8, "string": "foo foo", "captures": [{"offset": -1, "length": 0, "string": null, "name": "bar123"}]}'
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examples:
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- program: 'match("(abc)+"; "g")'
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input: '"abc abc"'
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output:
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- '{"offset": 0, "length": 3, "string": "abc", "captures": [{"offset": 0, "length": 3, "string": "abc", "name": null}]}'
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- '{"offset": 4, "length": 3, "string": "abc", "captures": [{"offset": 4, "length": 3, "string": "abc", "name": null}]}'
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- program: 'match("foo")'
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input: '"foo bar foo"'
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output: ['{"offset": 0, "length": 3, "string": "foo", "captures": []}']
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- program: 'match(["foo", "ig"])'
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input: '"foo bar FOO"'
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output:
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- '{"offset": 0, "length": 3, "string": "foo", "captures": []}'
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- '{"offset": 8, "length": 3, "string": "FOO", "captures": []}'
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- program: 'match("foo (?<bar123>bar)? foo"; "ig")'
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input: '"foo bar foo foo foo"'
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output:
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- '{"offset": 0, "length": 11, "string": "foo bar foo", "captures": [{"offset": 4, "length": 3, "string": "bar", "name": "bar123"}]}'
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- '{"offset": 12, "length": 8, "string": "foo foo", "captures": [{"offset": -1, "length": 0, "string": null, "name": "bar123"}]}'
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- program: '[ match("."; "g")] | length'
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input: '"abc"'
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output: 3
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- program: '[ match("."; "g")] | length'
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input: '"abc"'
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output: [3]
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- title: "`capture(val)`, `capture(regex; flags)`"
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body: |
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- title: "`capture(val)`, `capture(regex; flags)`"
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body: |
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Collects the named captures in a JSON object, with the name
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of each capture as the key, and the matched string as the
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corresponding value.
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Collects the named captures in a JSON object, with the name
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of each capture as the key, and the matched string as the
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corresponding value.
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examples:
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- program: 'capture("(?<a>[a-z]+)-(?<n>[0-9]+)")'
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input: '"xyzzy-14"'
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output: ['{ "a": "xyzzy", "n": "14" }']
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examples:
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- program: 'capture("(?<a>[a-z]+)-(?<n>[0-9]+)")'
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input: '"xyzzy-14"'
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output: ['{ "a": "xyzzy", "n": "14" }']
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- title: "`scan(regex)`, `scan(regex; flags)`"
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body: |
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- title: "`scan(regex)`, `scan(regex; flags)`"
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body: |
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Emit a stream of the non-overlapping substrings of the input
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that match the regex in accordance with the flags, if any
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have been specified. If there is no match, the stream is empty.
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To capture all the matches for each input string, use the idiom
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`[ expr ]`, e.g. `[ scan(regex) ]`.
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Emit a stream of the non-overlapping substrings of the input
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that match the regex in accordance with the flags, if any
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have been specified. If there is no match, the stream is empty.
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To capture all the matches for each input string, use the idiom
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`[ expr ]`, e.g. `[ scan(regex) ]`.
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example:
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- program: 'scan("c")'
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input: '"abcdefabc"'
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output: ['"c"', '"c"']
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example:
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- program: 'scan("c")'
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input: '"abcdefabc"'
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output: ['"c"', '"c"']
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- program: 'scan("b")'
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input: ("", "")
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output: ['[]', '[]']
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- program: 'scan("b")'
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input: ("", "")
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output: ['[]', '[]']
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- title: "`split(regex; flags)`"
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body: |
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- title: "`split(regex; flags)`"
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body: |
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For backwards compatibility, `split` emits an array of the strings
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corresponding to the successive segments of the input string after it
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has been split at the boundaries defined by the regex and any
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specified flags. The substrings corresponding to the boundaries
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themselves are excluded. If regex is the empty string, then the first
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match will be the empty string.
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For backwards compatibility, `split` emits an array of the strings
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corresponding to the successive segments of the input string after it
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has been split at the boundaries defined by the regex and any
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specified flags. The substrings corresponding to the boundaries
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themselves are excluded. If regex is the empty string, then the first
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match will be the empty string.
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example:
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- program: 'split(", *"; null)'
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input: '"ab,cd, ef"'
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output: ['"ab","cd","ef"']
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example:
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- program: 'split(", *"; null)'
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input: '"ab,cd, ef"'
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output: ['"ab","cd","ef"']
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- title: "`splits(regex)`, splits(regex; flags)`"
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body: |
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- title: "`splits(regex)`, `splits(regex; flags)`"
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body: |
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These provide the same results as their `split` counterparts,
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but as a stream instead of an array.
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These provide the same results as their `split` counterparts,
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but as a stream instead of an array.
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example:
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- program: 'splits(", *")'
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input: '("ab,cd", "ef, gh")'
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output: ['"ab"', '"cd"', '"ef"', '"gh"']
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example:
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- program: 'splits(", *")'
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input: '("ab,cd", "ef, gh")'
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output: ['"ab"', '"cd"', '"ef"', '"gh"']
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- title: "`sub(regex; tostring)`"
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body: |
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- title: "`sub(regex; tostring)`"
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body: |
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Emit the string obtained by replacing the first match of regex in the
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input string with `tostring`, after interpolation. `tostring` should
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be a jq string, and may contain references to named captures. The
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named captures are, in effect, presented as a JSON object (as
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constructed by `capture`) to `tostring`, so a reference to a captured
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variable named "x" would take the form: "\(.x)".
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Emit the string obtained by replacing the first match of regex in the
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input string with `tostring`, after interpolation. `tostring` should
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be a jq string, and may contain references to named captures. The
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named captures are, in effect, presented as a JSON object (as
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constructed by `capture`) to `tostring`, so a reference to a captured
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variable named "x" would take the form: "\(.x)".
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example:
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- program: 'sub("^[^a-z]*(?<x>[a-z]*).*")'
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input: '"123abc456"'
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output: '"ZabcZabc"'
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example:
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- program: 'sub("^[^a-z]*(?<x>[a-z]*).*")'
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input: '"123abc456"'
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output: '"ZabcZabc"'
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- title: "`gsub(regex; string)`"
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body: |
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- title: "`gsub(regex; string)`"
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body: |
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`gsub` is like `sub` but all the non-overlapping occurrences of the regex are
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replaced by the string, after interpolation.
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`gsub` is like `sub` but all the non-overlapping occurrences of the regex are
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replaced by the string, after interpolation.
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example:
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- program: 'gsub("(?<x>.)[^a]*"; "+\(.x)-")'
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input: '"Abcabc"'
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output: '"+A-+a-"'
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example:
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- program: 'gsub("(?<x>.)[^a]*"; "+\(.x)-")'
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input: '"Abcabc"'
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output: '"+A-+a-"'
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- title: Advanced features
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Vendored
+3
-3
@@ -70,8 +70,8 @@
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{% for example in entry.examples %}
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<table class="manual-example">
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<tr><th></th><td class="jqprogram">jq '{{example.program}}'</td></tr>
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<tr><th>Input</th><td>{{example.input}}</td></tr>
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<tr><th></th><td class="jqprogram">jq '{{example.program | escape}}'</td></tr>
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<tr><th>Input</th><td>{{example.input | escape}}</td></tr>
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{% unless example.output[0] %}
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<tr>
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<th>Output</th>
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@@ -85,7 +85,7 @@
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{% else %}
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<th></th>
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{% endif %}
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<td>{{output}}</td>
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<td>{{output | escape}}</td>
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</tr>
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{% endfor %}
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Block a user