How to parse for tags with '+' in python

Question

I\'m getting a \"nothing to repeat\" error when I try to compile this:

search = re.compile(r\'([^a-zA-Z0-9])(%s)([^a-zA-Z0-9])\' % \'+test\', re.I)
         


        

Answer 1

Escape the plus:

r'\+test'

The plus has a special meaning in regexes (meaning "match the previous once or several times"). Since in your regex it appears after an open paren, there is no "previous" to match repeatedly.