Skip to main content

regex

Returns a string which is the subset of haystack that matches the regular expression pattern.

If no matches to pattern are present in `haystack`, returns an empty string.

If pattern is empty or is an invalid regular expression, throws an exception.

Usage​

{{regex haystack pattern flags="rt"}}

Arguments​

haystack
The input string.

pattern
A valid regular expression.

flags

  • r: return the last match to pattern instead of the first match
  • t: trim the final result prior to returning (remove all whitespace from beginning and end)

Examples​

Return the first match to pattern (assuming email.body contains "This is red and that is blue and that is green.")

{{regex email.body '/ is [^r]/' flags='t'}}
 is b