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Using replace filter we can match pattern using regular expressions, but can we use part of the matched string in the second argument of filter? For example, I want to match all numbers and replace each matched number with a matched number enclosed in parentheses.

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Craft's replace filter will just use PHP's preg_replace method behind the scenes if it detects that a regular expression has been passed in.

It sounds like you're looking for the PHP preg_match method, which isn't available natively.

There was a plugin that added support for this in Craft 2, but I don't think it's been ported to Craft 3. You might be able to use that as a starting point if you'd like to port it, though.

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    I just created a Craft 3 version of this plugin with a few more filters. Still in testing before submission to plugin store but can be installed via composer command. github.com/indigoviking/expressive Dec 28 '18 at 23:34

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