66 lines
2.5 KiB
Markdown
66 lines
2.5 KiB
Markdown
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zsh-syntax-highlighting / highlighters / regexp
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This is the `regexp` highlighter, that highlights user-defined regular
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expressions. It's similar to the `pattern` highlighter, but allows more complex
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patterns.
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### How to tweak it
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To use this highlighter, associate regular expressions with styles in the
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`ZSH_HIGHLIGHT_REGEXP` associative array, for example in `~/.zshrc`:
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```zsh
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typeset -A ZSH_HIGHLIGHT_REGEXP
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ZSH_HIGHLIGHT_REGEXP+=('^rm .*' fg=red,bold)
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```
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This will highlight lines that start with a call to the `rm` command.
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The regular expressions flavour used is [PCRE][pcresyntax] when the
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`RE_MATCH_PCRE` option is set and POSIX Extended Regular Expressions (ERE),
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as implemented by the platform's C library, otherwise. For details on the
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latter, see [the `zsh/regex` module's documentation][MAN_ZSH_REGEX] and the
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`regcomp(3)` and `re_format(7)` manual pages on your system.
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For instance, to highlight `sudo` only as a complete word, i.e., `sudo cmd`,
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but not `sudoedit`, one might use:
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* When the `RE_MATCH_PCRE` is set:
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```zsh
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typeset -A ZSH_HIGHLIGHT_REGEXP
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ZSH_HIGHLIGHT_REGEXP+=('\bsudo\b' fg=123,bold)
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```
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* When the `RE_MATCH_PCRE` is unset, on platforms with GNU `libc` (e.g., many GNU/Linux distributions):
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```zsh
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typeset -A ZSH_HIGHLIGHT_REGEXP
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ZSH_HIGHLIGHT_REGEXP+=('\<sudo\>' fg=123,bold)
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```
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* When the `RE_MATCH_PCRE` is unset, on BSD-based platforms (e.g., macOS):
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```zsh
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typeset -A ZSH_HIGHLIGHT_REGEXP
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ZSH_HIGHLIGHT_REGEXP+=('[[:<:]]sudo[[:>:]]' fg=123,bold)
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```
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Note, however, that PCRE and POSIX ERE have a large common subset:
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for instance, the regular expressions `[abc]`, `a*`, and `(a|b)` have the same
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meaning in both flavours.
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The syntax for values is the same as the syntax of "types of highlighting" of
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the zsh builtin `$zle_highlight` array, which is documented in [the `zshzle(1)`
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manual page][zshzle-Character-Highlighting].
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See also: [regular expressions tutorial][perlretut], zsh regexp operator `=~`
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in [the `zshmisc(1)` manual page][zshmisc-Conditional-Expressions]
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[zshzle-Character-Highlighting]: https://zsh.sourceforge.io/Doc/Release/Zsh-Line-Editor.html#Character-Highlighting
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[perlretut]: https://perldoc.perl.org/perlretut
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[zshmisc-Conditional-Expressions]: https://zsh.sourceforge.io/Doc/Release/Conditional-Expressions.html#Conditional-Expressions
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[MAN_ZSH_REGEX]: https://zsh.sourceforge.io/Doc/Release/Zsh-Modules.html#The-zsh_002fregex-Module
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[pcresyntax]: https://www.pcre.org/original/doc/html/pcresyntax.html
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