This function removes characters from text a (from left or right) until the regular expression b matches. The function returns the first trimmed text that matches the regular expression. If the regular expression never matches, an empty string is returned.

Parameters

Parameter	Description
a	Text.
b	Regular expression.
c	(optional) "true" if the text should be trimmed from the right side. "false" if the text should be trimmed from the left side. Default: "false".

Examples

Parameter a	Parameter b	Parameter c	Result
000978456008918765	^[1-9].*		978456008918765
000978456008918765	^[1-9].*	false	978456008918765
000978456008918765	^[1-9].*	true
hello, world?!#***	.*\?$	true	hello, world?