Merge commit 'e509cac533600cf4fa8382c9cdab78ddd82db688'

docs/content/en/functions/strings/FindRe.md

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+---
+title: strings.FindRE
+linkTitle: findRE
+description: Returns a slice of strings that match the regular expression.
+categories: [functions]
+keywords: []
+menu:
+  docs:
+    parent: functions
+function:
+  aliases: [findRE]
+  returnType: string
+  signatures: ['strings.FindRE PATTERN INPUT [LIMIT]']
+relatedFunctions:
+  - strings.FindRE
+  - strings.FindRESubmatch
+  - strings.Replace
+  - strings.ReplaceRE
+aliases: [/functions/findre]
+---
+By default, `findRE` finds all matches. You can limit the number of matches with an optional LIMIT argument.
+
+{{% readfile file="/functions/_common/regular-expressions.md" %}}
+
+This example returns a slice of all second level headings (`h2` elements) within the rendered `.Content`:
+
+```go-html-template
+{{ findRE `(?s)<h2.*?>.*?</h2>` .Content }}
+```
+
+The `s` flag causes `.` to match `\n` as well, allowing us to find an `h2` element that contains newlines.
+
+To limit the number of matches to one:
+
+```go-html-template
+{{ findRE `(?s)<h2.*?>.*?</h2>` .Content 1 }}
+```
+
+{{% note %}}
+You can write and test your regular expression using [regex101.com](https://regex101.com/). Be sure to select the Go flavor before you begin.
+{{% /note %}}