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71 lines
2.3 KiB
ReStructuredText
71 lines
2.3 KiB
ReStructuredText
string-replace - replace substrings
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===================================
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Synopsis
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--------
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.. BEGIN SYNOPSIS
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.. synopsis::
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string replace [-a | --all] [-f | --filter] [-i | --ignore-case]
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[-r | --regex] [(-m | --max-matches) MAX] [-q | --quiet]
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PATTERN REPLACEMENT [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 replace`` is similar to ``string match`` but replaces non-overlapping matching substrings with a replacement string and prints the result. By default, *PATTERN* is treated as a literal substring to be matched.
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If **-r** or **--regex** is given, *PATTERN* is interpreted as a Perl-compatible regular expression, and *REPLACEMENT* can contain C-style escape sequences like **\t** as well as references to capturing groups by number or name as *$n* or *${n}*.
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If you specify the **-f** or **--filter** flag then each input string is printed only if a replacement was done. This is useful where you would otherwise use this idiom: ``a_cmd | string match pattern | string replace pattern new_pattern``. You can instead just write ``a_cmd | string replace --filter pattern new_pattern``.
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If **--max-matches MAX** or **-m MAX** is used, ``string replace`` will stop all processing after MAX lines of input have matched the specified pattern. In the event of ``--filter`` or ``-f``, this means the output will be MAX lines in length. This can be used as an "early exit" optimization when processing long inputs but expecting a limited and fixed number of outputs that might be found considerably before the input stream has been exhausted.
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Exit status: 0 if at least one replacement was performed, 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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Replace Literal Examples
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^^^^^^^^^^^^^^^^^^^^^^^^
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::
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>_ string replace is was 'blue is my favorite'
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blue was my favorite
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>_ string replace 3rd last 1st 2nd 3rd
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1st
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2nd
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last
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>_ string replace -a ' ' _ 'spaces to underscores'
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spaces_to_underscores
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Replace Regex Examples
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^^^^^^^^^^^^^^^^^^^^^^
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::
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>_ string replace -r -a '[^\d.]+' ' ' '0 one two 3.14 four 5x'
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0 3.14 5
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>_ string replace -r '(\w+)\s+(\w+)' '$2 $1 $$' 'left right'
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right left $
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>_ string replace -r '\s*newline\s*' '\n' 'put a newline here'
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put a
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here
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.. END EXAMPLES
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