using regex for filter's argument in liquid for designer

[jojosati]

Could liquid parse some filter's argument as reqex instead of normal string ?

normal string
{{ 'foofoo' | replace:'foo','bar' }} #=> 'barbar'

regex pattern
{{'foofo' | replace:/foo.*/,'bar'}} #=> 'bar'

sathit

[nickpearson]

I'm not sure how likely it is that this will be added to Liquid due to the security issues around regular expressions (example), but if you're working on a project where you can add custom filters, here's a simplified version of one that I use that accomplishes what you want:

def regexreplace(input, regex, replacement = '')
  input.to_s.gsub(Regexp.new(regex), replacement.to_s)
end

This is the same as the replace filter in StandardFilters, except that it converts the second parameter into a Regexp before passing it to String#gsub.

[jojosati]

Thank you, but how to put it into shopify's liquid engine.

example

# prevent expose secret info in comment tag within product description
{{ product.description | replace: /\<\!--.*?--\>/, '' }}

[nickpearson]

See the Create your own filters section of Liquid for Programmers on the wiki.

[fw42]

Yes, a custom filter seems like a better solution here.