Searching for a list of strings in a file with Python
Peter Otten
__peter__ at web.de
Mon Oct 14 02:33:41 EDT 2013
Starriol wrote:
> Hi guys,
>
> I'm trying to search for several strings, which I have in a .txt file line
> by line, on another file. So the idea is, take input.txt and search for
> each line in that file in another file, let's call it rules.txt.
>
> So far, I've been able to do this, to search for individual strings:
>
> [code]import re
>
> shakes = open("output.csv", "r")
>
> for line in shakes:
> if re.match("STRING", line):
> print line,[/code]
>
> How can I change this to input the strings to be searched from another
> file?
Assuming every line in input.txt contains a regular expression and you don't
care which one matches:
shakes = open("output.csv")
# you will iterate over the regex multiple times,
# so put them in a list
rattles = [line.strip() for line in open("input.txt")]
for line in shakes:
for expr in rattles:
if re.match(expr, line):
print line,
break # out of the for-rattles loop
# at the first matching regex
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