Analog Kid wrote:
Hi All:I am new to regular expressions in general, and not just re in python. So, apologies if you find my question stupid :) I need some help with forming a regex. Here is my scenario ... I have strings coming in from a list, each of which I want to check against a regular expression and see whether or not it "qualifies". By that I mean I have a certain set of characters that are permissible and if the string has characters which are not permissible, I need to flag that string ... here is a snip ...flagged = list() strs = ['HELLO', 'Hi%20There', '123...@#@'] p = re.compile(r"""[^a-zA-Z0-9]""", re.UNICODE) for s in strs: if len(p.findall(s)) > 0: flagged.append(s) print flaggedmy question is ... if I wanted to allow '%20' but not '%', how would my current regex (r"""[^a-zA-Z0-9]""") be modified?
You might want to normalize before checking, e.g.
from urllib import unquote
p=re.compile("[^a-zA-Z0-9 ]")
flagged=[]
for s in strs:
if p.search(unquote(s)):
flagged.append(s)
be carefull however if you want to show the
flagged ones back to the user. Best is always
quote/unquote at the boundaries as appropriate.
Regards
Tino
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