mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-30 04:43:20 -05:00
45 lines
1.5 KiB
Markdown
45 lines
1.5 KiB
Markdown
---
|
|
title: findRE
|
|
description: Returns a list of strings that match the regular expression.
|
|
godocref:
|
|
date: 2017-02-01
|
|
publishdate: 2017-02-01
|
|
lastmod: 2017-02-01
|
|
categories: [functions]
|
|
menu:
|
|
docs:
|
|
parent: "functions"
|
|
keywords: [regex]
|
|
signature: ["findRE PATTERN INPUT [LIMIT]"]
|
|
workson: []
|
|
hugoversion:
|
|
relatedfuncs: []
|
|
deprecated: false
|
|
aliases: []
|
|
---
|
|
|
|
By default all matches will be included. The number of matches can be limited 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 Go'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).
|
|
|
|
If you are just learning RegEx, or at least Go's flavor, you can practice pattern matching in the browser at <https://regex101.com/>.
|
|
{{% /note %}}
|
|
|
|
[partials]: /templates/partials/
|
|
[`plainify`]: /functions/plainify/
|
|
[toc]: /content-management/toc/
|
|
[`urlize`]: /functions/urlize
|