Suppose I have these strings:
a = "hello"
b = "-hello"
c = "-"
d = "hell-o"
e = " - "
How do I match only the -
(String C
)? I've tried a if "-" in something
but obviously that isn't correct. Could someone please advise?
Let's say we put these strings into a list, looped through and all I wanted to extract was C
. How would I do this?
for aa in list1:
if not re.findall('[^-$]'):
print aa
Would that be too messy?
If you want to match only variable c
:
if '-' == something:
print 'hurray!'
To answer the updates: yes, that would be too messy. You don't need regex there. Simple string methods are faster:
>>> lst =["hello", "-hello", "-", "hell-o"," - "]
>>> for i, item in enumerate(lst):
if item == '-':
print(i, item)
2 -
作为正则表达式,其“ ^-$”
如果您要删除的是破折号(即he-llo
给hello
),那么这对于生成器表达式来说更像是一项工作。
''.join((char for char in 'he-llo' if char != '-'))
if "-" in c and len(c) ==1 : print "do something"
要么
if c=="-"
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.