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.zsh/plugins/syntax-highlighting/docs/highlighters/regexp.md

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