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47 lines
1.5 KiB
Markdown
47 lines
1.5 KiB
Markdown
---
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title: findRE
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description: Returns a list of strings that match the regular expression.
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godocref:
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date: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2017-02-01
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categories: [functions]
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menu:
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docs:
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parent: "functions"
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keywords: [regex]
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signature: ["findRE PATTERN INPUT [LIMIT]"]
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workson: []
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hugoversion:
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relatedfuncs: []
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deprecated: false
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aliases: []
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---
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By default all matches will be included. The number of matches can be limitted with an optional third parameter.
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The example below returns a list of all second level headers (`<h2>`) in the content:
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```
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{{ findRE "<h2.*?>(.|\n)*?</h2>" .Content }}
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```
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You can limit the number of matches in the list with a third parameter. The following example shows how to limit the returned value to just one match (or none, if there are no matched substrings):
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```
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{{ findRE "<h2.*?>(.|\n)*?</h2>" .Content 1 }}
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<!-- returns ["<h2 id="#foo">Foo</h2>"] -->
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```
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{{% note %}}
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Hugo uses Golang's [Regular Expression package](https://golang.org/pkg/regexp/), which is the same general syntax used by Perl, Python, and other languages but with a few minor differences for those coming from a background in PCRE. For a full syntax listing, see the [GitHub wiki for re2](https://github.com/google/re2/wiki/Syntax).
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If you are just learning RegEx, or at least Golang's flavor, you can practice pattern matching in the browser at <https://regex101.com/>.
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{{% /note %}}
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[partials]: /templates/partials/
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[`plainify`]: /functions/plainify/
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[toc]: /content-management/toc/
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[`urlize`]: /functions/urlize
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