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+---
+title: replaceRE
+description: Returns a string, replacing all occurrences of a regular expression with a replacement pattern.
+categories: [functions]
+menu:
+  docs:
+    parent: functions
+keywords: [regex]
+signature:
+  - "replaceRE PATTERN REPLACEMENT INPUT [LIMIT]"
+  - "strings.ReplaceRE PATTERN REPLACEMENT INPUT [LIMIT]"
+relatedfuncs: [findRE]
+aliases: []
+---
+By default, the `replaceRE` function replaces all matches. You can limit the number of matches with an optional LIMIT paramater.
+
+When specifying the regular expression, use a raw [string literal] (backticks) instead of an interpreted string literal (double quotes) to simplify the syntax. With an interpreted string literal you must escape backslashes.
+
+The syntax of the regular expression is the same general syntax used by Perl, Python, and other languages. More precisely, it is the syntax accepted by [RE2] except for `\C`.
+
+This example replaces two or more consecutive hyphens with a single hyphen:
+
+```go-html-template
+{{ $s := "a-b--c---d" }}
+{{ replaceRE `(-{2,})` "-" $s }} → a-b-c-d
+```
+
+To limit the number of replacements to one:
+
+```go-html-template
+{{ $s := "a-b--c---d" }}
+{{ replaceRE `(-{2,})` "-" $s 1 }} → a-b-c---d
+```
+
+You can use `$1`, `$2`, etc. within the replacement string to insert the groups captured within the regular expression:
+
+```go-html-template
+{{ $s := "http://gohugo.io/docs" }}
+{{ replaceRE "^https?://([^/]+).*" "$1" $s }} → 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 %}}
+
+[RE2]: https://github.com/google/re2/wiki/Syntax
+[string literal]: https://go.dev/ref/spec#String_literals