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| title | description | godocref | date | publishdate | lastmod | categories | menu | keywords | signature | workson | hugoversion | relatedfuncs | deprecated | aliases | |||||||
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| findRE | Returns a list of strings that match the regular expression. | 2017-02-01 | 2017-02-01 | 2017-02-01 |
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By default all matches will be included. The number of matches can be limitted with an optional third parameter.
The example below returns a list of all second level headers (<h2>) in the content:
{{ findRE "<h2.*?>(.|\n)*?</h2>" .Content }}
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):
{{ findRE "<h2.*?>(.|\n)*?</h2>" .Content 1 }}
<!-- returns ["<h2 id="#foo">Foo</h2>"] -->
{{% note %}} Hugo uses Golang's Regular Expression package, 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.
If you are just learning RegEx, or at least Golang's flavor, you can practice pattern matching in the browser at https://regex101.com/. {{% /note %}}