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35 lines
1 KiB
Markdown
35 lines
1 KiB
Markdown
---
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title: findRE
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description: Returns a slice of strings that match the regular expression.
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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:
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- "findRE PATTERN INPUT [LIMIT]"
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- "strings.FindRE PATTERN INPUT [LIMIT]"
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relatedfuncs: [findRESubmatch, replaceRE]
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---
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By default, `findRE` finds all matches. You can limit the number of matches with an optional LIMIT parameter.
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{{% readfile file="/functions/common/regular-expressions.md" %}}
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This example returns a slice of all second level headings (`h2` elements) within the rendered `.Content`:
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```go-html-template
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{{ findRE `(?s)<h2.*?>.*?</h2>` .Content }}
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```
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The `s` flag causes `.` to match `\n` as well, allowing us to find an `h2` element that contains newlines.
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To limit the number of matches to one:
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```go-html-template
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{{ findRE `(?s)<h2.*?>.*?</h2>` .Content 1 }}
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```
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{{% note %}}
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You can write and test your regular expression using [regex101.com](https://regex101.com/). Be sure to select the Go flavor before you begin.
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{{% /note %}}
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