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45 lines
1.4 KiB
Markdown
45 lines
1.4 KiB
Markdown
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_Regular expressions_ (or short _regexes_) are often used to check if a text matches a certain pattern. For example the regex `ab?c` would match `abc` or `ac`, but not `abbc` or `123`. In Chatterino, you can use them to highlight messages (and more) based on complex conditions.
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Basic patterns:
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|Pattern |Matches|
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|-|-|
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|`x?` |nothing or `x`|
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|`x*` |`x`, repeated any number of times|
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|`x+` |`x`, repeated any number of times but at least 1|
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|`^` |The start of the text|
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|`$` |The end of the text|
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|`x\|y` |`x` or `y`|
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You can group multiple statements with `()`:
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|Pattern |Matches|
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|-|-|
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|`asd?` |`asd` or `as`|
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|`(asd)?` |`asd` or nothing|
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|`\(asd\)` |`(asd)`, literally|
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You can also group multiple characters with `[]`:
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|Pattern |Matches|
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|-|-|
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|`[xyz]` |`x`, `y` or `z`|
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|`[1-5a-f]` |`1`,`2`,`3`,`4`,`5`,`a`,`b`,`c`,`d`,`e`,`f`|
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|`[^abc]` |Anything, **except** `a`, `b` and `c`|
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|`[\-]` |`-`, literally (escaped with `\`)|
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|`\[xyz\]` |`[xyz]`, literally|
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Special patterns:
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|Pattern |Matches|
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|-|-|
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|`\d` |Digit characters (0-9)|
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|`\D` |Non-digit characters|
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|`\w` |Word characters (a-zA-Z0-9_)|
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|`\W` |Non-word characters|
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|`\s` |Spaces, tabs, etc.|
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|`\S` |Not spaces, tabs, etc.|
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|`\b` |Word boundaries (between \w and \W)|
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|`\B` |Non-word boundaries|
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You can try out your regex pattern on websites like [https://regex101.com/](regex101.com).
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