Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
536 views
in Technique[技术] by (71.8m points)

regex - Python regular expression not matching

This is one of those things where I'm sure I'm missing something simple, but... In the sample program below, I'm trying to use Python's RE library to parse the string "line" to get the floating-point number just before the percent sign, i.e. "90.31". But the code always prints "no match".

I've tried a couple other regular expressions as well, all with the same result. What am I missing?

#!/usr/bin/python
import re
line = '    0 repaired, 90.31% done'
pct_re = re.compile(' (d+.d+)% done$')
#pct_re = re.compile(', (.+)% done$')
#pct_re = re.compile(' (d+.*)% done$')
match = pct_re.match(line)
if match: print 'got match, pct=' + match.group(1)
else: print 'no match'
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

match only matches from the beginning of the string. Your code works fine if you do pct_re.search(line) instead.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...