hugo/content/en/functions/findRe.md
Bjørn Erik Pedersen efa74c5c6e Squashed 'docs/' changes from 9be494de3..ac2c4a487
ac2c4a487 Update documentation for Ugly URLs (#1082)
88bdec17a Change 072.0 to 0.72.0 in release post's description
2aa7d7818 Update rss.md (#1104)
c80677aeb Update quick-start.md (#1076)
d04196bbd Minor spelling and capitalization fixes
837d2feba Fixed spelling mistake
67dc78e12 Update installing.md
ce280c5d6 Update relurl.md
bb4d0e703 Capitalization and Redirecting URL fixes
e1fecada0 Update partials.md
1d99bb182 Typos and whitespacing issues fixed
b20dba125 actually fix index function link this time
f47d6f1e3 Fixing typos, whitespace issues and links
dc82309b9 fix link to the index function
1eab0cbea add missing word (#1130)
9c3ee62ae more fixes
e9bc5880a whitespace, typos and HTTPS fixes
93b806493 Add missing word to Module section
80ced9062 Display image on page bundles page.
727029b0a Update index.md
51fc48e4d Release 0.72.0
1ff68ac3b releaser: Add release notes to /docs for release of 0.72.0
f74a25b92 common/maps: Add Scratch.Values
2fd83db96 Add redirect support to the server
bdfccf9f4 Fix typo in install instructions
e12737ea6 Create SUPPORT.md

git-subtree-dir: docs
git-subtree-split: ac2c4a4871e90ddfb180f23704ce7ec9023529ca
2020-06-16 14:18:51 +02:00

1.5 KiB

title description godocref date publishdate lastmod categories menu keywords signature workson hugoversion relatedfuncs deprecated aliases
findRE Returns a list of strings that match the regular expression. 2017-02-01 2017-02-01 2017-02-01
functions
docs
parent
functions
regex
findRE PATTERN INPUT [LIMIT]
false

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, 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 Go's flavor, you can practice pattern matching in the browser at https://regex101.com/. {{% /note %}}