37 lines
1.2 KiB
Markdown
37 lines
1.2 KiB
Markdown
---
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alias: [ "vim regex lookahead", "vim regex lookbehind", "vim regex lookaround", "lookahead", "lookbehind", "lookaround" ]
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---
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up:: [[vim regex]]
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title:: "before and after matches"
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#informatique
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---
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Allows to match pattern after (lookahead) or before (lookbehind) the current pattern.
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# Quick reference
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- `\zs` starts the selection (everything before is searched for but not matched)
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- `\ze` stop the selection (everything after is searched for but not matched)
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| | positive | negative |
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| ---------- | -------- | -------- |
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| lookahead |`@=`|`@!`|
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| lookbehind |`@<=`|`@<!`|
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# Exemples
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> [!example] president (not (Macron|Hollande))
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> To match President if it is **not** `President Macron` or `President Hollande`.
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> Note that the match will select only `President` (else the regex is obvious).
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> `President\(Macron\|Hollande\)\@!`
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> Or, with verymagic mode
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> `\vPresident(Macron|Hollande)@!`
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> [!example] python attributes, but not of self
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> Match any python attribute (a word after a dot), except attributes of `self` (attributes of an object from the object itself)
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> `\(self\)\@<!\.\zs\w\+`
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> or, with verymagic mode
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> `\v(self)@<!.\zs\<+`
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>
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