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0304135d2b
Instead of informing the bell character (hex 07), the example was using
an escaped \ followed by x07.
$ echo \\x07
\x07
$ echo \x07
$ echo \x07 | od -a
0000000 bel nl
0000002
$
* docs: Use \u instead of \\u
Instead of informing the Unicode character 慡, this example was using an
escaped \ followed by u6161.
$ echo \\u6161
\u6161
$ echo \u6161
慡
Before:
$ string escape --style=var 'a1 b2'\\u6161 | string unescape --style=var
a1 b2\u6161
Now:
$ string escape --style=var 'a1 b2'\u6161 | string unescape --style=var
a1 b2慡
109 lines
3.1 KiB
ReStructuredText
109 lines
3.1 KiB
ReStructuredText
string-match - match substrings
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===============================
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Synopsis
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--------
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.. BEGIN SYNOPSIS
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::
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string match [(-a | --all)] [(-e | --entire)] [(-i | --ignore-case)] [(-r | --regex)] [(-n | --index)] [(-q | --quiet)] [(-v | --invert)] PATTERN [STRING...]
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.. END SYNOPSIS
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Description
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-----------
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.. BEGIN DESCRIPTION
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``string match`` tests each STRING against PATTERN and prints matching substrings. Only the first match for each STRING is reported unless ``-a`` or ``--all`` is given, in which case all matches are reported.
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If you specify the ``-e`` or ``--entire`` then each matching string is printed including any prefix or suffix not matched by the pattern (equivalent to ``grep`` without the ``-o`` flag). You can, obviously, achieve the same result by prepending and appending ``*`` or ``.*`` depending on whether or not you have specified the ``--regex`` flag. The ``--entire`` flag is simply a way to avoid having to complicate the pattern in that fashion and make the intent of the ``string match`` clearer. Without ``--entire`` and ``--regex``, a PATTERN will need to match the entire STRING before it will be reported.
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Matching can be made case-insensitive with ``--ignore-case`` or ``-i``.
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If ``--index`` or ``-n`` is given, each match is reported as a 1-based start position and a length. By default, PATTERN is interpreted as a glob pattern matched against each entire STRING argument. A glob pattern is only considered a valid match if it matches the entire STRING.
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If ``--regex`` or ``-r`` is given, PATTERN is interpreted as a Perl-compatible regular expression, which does not have to match the entire STRING. For a regular expression containing capturing groups, multiple items will be reported for each match, one for the entire match and one for each capturing group. With this, only the matching part of the STRING will be reported, unless ``--entire`` is given.
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If ``--invert`` or ``-v`` is used the selected lines will be only those which do not match the given glob pattern or regular expression.
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Exit status: 0 if at least one match was found, or 1 otherwise.
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.. END DESCRIPTION
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Examples
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--------
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.. BEGIN EXAMPLES
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Match Glob Examples
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^^^^^^^^^^^^^^^^^^^
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::
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>_ string match '?' a
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a
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>_ string match 'a*b' axxb
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axxb
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>_ string match -i 'a??B' Axxb
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Axxb
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>_ echo 'ok?' | string match '*\?'
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ok?
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# Note that only the second STRING will match here.
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>_ string match 'foo' 'foo1' 'foo' 'foo2'
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foo
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>_ string match -e 'foo' 'foo1' 'foo' 'foo2'
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foo1
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foo
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foo2
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>_ string match 'foo?' 'foo1' 'foo' 'foo2'
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foo1
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foo
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foo2
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Match Regex Examples
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^^^^^^^^^^^^^^^^^^^^
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::
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>_ string match -r 'cat|dog|fish' 'nice dog'
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dog
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>_ string match -r -v "c.*[12]" {cat,dog}(seq 1 4)
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dog1
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dog2
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cat3
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dog3
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cat4
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dog4
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>_ string match -r '(\d\d?):(\d\d):(\d\d)' 2:34:56
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2:34:56
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2
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34
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56
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>_ string match -r '^(\w{2,4})\1$' papa mud murmur
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papa
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pa
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murmur
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mur
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>_ string match -r -a -n at ratatat
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2 2
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4 2
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6 2
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>_ string match -r -i '0x[0-9a-f]{1,8}' 'int magic = 0xBadC0de;'
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0xBadC0de
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.. END EXAMPLES
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