I am looking to match a string that is inputted from a website to check if is alpha-numeric and possibly contains an underscore. My code:
if re.match('[a-zA-Z0-9_]',playerName): # do stuff
For some reason, this matches with crazy chars for example: nIg○▲ ☆ ★ ◇ ◆
I only want regular A-Z and 0-9 and _ matching, is there something i am missing here?
Python has a special sequence
\w for matching alphanumeric and underscore when the
UNICODE flags are not specified. So you can modify your pattern as,
pattern = '^\w+$'
Your regex only matches one character. Try this instead: