mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-14 20:37:55 -05:00
91 lines
2.2 KiB
Markdown
91 lines
2.2 KiB
Markdown
|
---
|
||
|
|
title: strings.FindRESubmatch
|
||
|
|
description: Returns a slice of all successive matches of the regular expression. Each element is a slice of strings holding the text of the leftmost match of the regular expression and the matches, if any, of its subexpressions.
|
||
|
|
categories: []
|
||
|
|
keywords: []
|
||
|
|
action:
|
||
|
|
aliases: [findRESubmatch]
|
||
|
|
related:
|
||
|
|
- functions/strings/FindRE
|
||
|
|
- functions/strings/Replace
|
||
|
|
- functions/strings/ReplaceRE
|
||
|
|
returnType: '[][]string'
|
||
|
|
signatures: ['strings.FindRESubmatch PATTERN INPUT [LIMIT]']
|
||
|
|
aliases: [/functions/findresubmatch]
|
||
|
|
---
|
||
|
|
|
||
|
|
By default, `findRESubmatch` finds all matches. You can limit the number of matches with an optional LIMIT argument. A return value of nil indicates no match.
|
||
|
|
|
||
|
|
{{% include "functions/_common/regular-expressions.md" %}}
|
||
|
|
|
||
|
|
## Demonstrative examples
|
||
|
|
|
||
|
|
```go-html-template
|
||
|
|
{{ findRESubmatch `a(x*)b` "-ab-" }} → [["ab" ""]]
|
||
|
|
{{ findRESubmatch `a(x*)b` "-axxb-" }} → [["axxb" "xx"]]
|
||
|
|
{{ findRESubmatch `a(x*)b` "-ab-axb-" }} → [["ab" ""] ["axb" "x"]]
|
||
|
|
{{ findRESubmatch `a(x*)b` "-axxb-ab-" }} → [["axxb" "xx"] ["ab" ""]]
|
||
|
|
{{ findRESubmatch `a(x*)b` "-axxb-ab-" 1 }} → [["axxb" "xx"]]
|
||
|
|
```
|
||
|
|
|
||
|
|
## Practical example
|
||
|
|
|
||
|
|
This markdown:
|
||
|
|
|
||
|
|
```text
|
||
|
|
- [Example](https://example.org)
|
||
|
|
- [Hugo](https://gohugo.io)
|
||
|
|
```
|
||
|
|
|
||
|
|
Produces this HTML:
|
||
|
|
|
||
|
|
```html
|
||
|
|
<ul>
|
||
|
|
<li><a href="https://example.org">Example</a></li>
|
||
|
|
<li><a href="https://gohugo.io">Hugo</a></li>
|
||
|
|
</ul>
|
||
|
|
```
|
||
|
|
|
||
|
|
To match the anchor elements, capturing the link destination and text:
|
||
|
|
|
||
|
|
```go-html-template
|
||
|
|
{{ $regex := `<a\s*href="(.+?)">(.+?)</a>` }}
|
||
|
|
{{ $matches := findRESubmatch $regex .Content }}
|
||
|
|
```
|
||
|
|
|
||
|
|
Viewed as JSON, the data structure of `$matches` in the code above is:
|
||
|
|
|
||
|
|
```json
|
||
|
|
[
|
||
|
|
[
|
||
|
|
"<a href=\"https://example.org\"></a>Example</a>",
|
||
|
|
"https://example.org",
|
||
|
|
"Example"
|
||
|
|
],
|
||
|
|
[
|
||
|
|
"<a href=\"https://gohugo.io\">Hugo</a>",
|
||
|
|
"https://gohugo.io",
|
||
|
|
"Hugo"
|
||
|
|
]
|
||
|
|
]
|
||
|
|
```
|
||
|
|
|
||
|
|
To render the `href` attributes:
|
||
|
|
|
||
|
|
```go-html-template
|
||
|
|
{{ range $matches }}
|
||
|
|
{{ index . 1 }}
|
||
|
|
{{ end }}
|
||
|
|
```
|
||
|
|
|
||
|
|
Result:
|
||
|
|
|
||
|
|
```text
|
||
|
|
https://example.org
|
||
|
|
https://gohugo.io
|
||
|
|
```
|
||
|
|
|
||
|
|
{{% 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 %}}
|