---
layout: page
title: "JavaScript preg_quote function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/preg_quote:491
- /functions/view/preg_quote
- /functions/view/491
- /functions/preg_quote:491
- /functions/491
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's preg_quote

{% codeblock pcre/preg_quote.js lang:js https://raw.github.com/kvz/phpjs/master/functions/pcre/preg_quote.js raw on github %}
function preg_quote (str, delimiter) {
  // From: http://phpjs.org/functions
  // +   original by: booeyOH
  // +   improved by: Ates Goral (http://magnetiq.com)
  // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // +   bugfixed by: Onno Marsman
  // +   improved by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: preg_quote("$40");
  // *     returns 1: '\$40'
  // *     example 2: preg_quote("*RRRING* Hello?");
  // *     returns 2: '\*RRRING\* Hello\?'
  // *     example 3: preg_quote("\\.+*?[^]$(){}=!<>|:");
  // *     returns 3: '\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:'
  return (str + '').replace(new RegExp('[.\\\\+*?\\[\\^\\]$(){}=!<>|:\\' + (delimiter || '') + '-]', 'g'), '\\$&');
}
{% endcodeblock %}

 - [Raw function on GitHub](https://github.com/kvz/phpjs/blob/master/functions/pcre/preg_quote.js)

Please note that php.js uses JavaScript objects as substitutes for PHP arrays, they are 
the closest match to this hashtable-like data structure. 

Please also note that php.js offers community built functions and goes by the 
[McDonald's Theory](https://medium.com/what-i-learned-building/9216e1c9da7d). We'll put online 
functions that are far from perfect, in the hopes to spark better contributions. 
Do you have one? Then please just: 

 - [Edit on GitHub](https://github.com/kvz/phpjs/edit/master/functions/pcre/preg_quote.js)

### Example 1
This code
{% codeblock lang:js example %}
preg_quote("$40");
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'\$40'
{% endcodeblock %}

### Example 2
This code
{% codeblock lang:js example %}
preg_quote("*RRRING* Hello?");
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'\*RRRING\* Hello\?'
{% endcodeblock %}

### Example 3
This code
{% codeblock lang:js example %}
preg_quote("\\.+*?[^]$(){}=!<>|:");
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
'\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:'
{% endcodeblock %}


### Other PHP functions in the pcre extension
{% render_partial _includes/custom/pcre.html %}