RegEx replace in Python

Question

I'm pretty new to regular expressions. I've worked out the string (?i)\$url\[([0-9])\] to match what I'm looking for. I want a string like "this is $url[2] a string" to be passed through that regex, have 2 passed to a function, which returns a string, and $url[2] is replaced with that string. How do I do that?

Does the regex work? Have you learned Python? What did you try? — agf
– agf, Commented Aug 20, 2011 at 22:04

jtbandes · Accepted Answer · 2011-08-20 22:04:16Z

3

def myrepl(match):
    num = int(match.group(1))
    # Do something here
    return str(num) # this will replace the $url[2]

mystr = "this is $url[2] a string"

print re.sub(r'\$url\[([0-9])\]', myrepl, mystr, flags=re.IGNORECASE)

answered Aug 20, 2011 at 22:04

jtbandes

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