我如何找到两个子字符串('123STRINGabc' -> '字符串')之间的字符串?

我现在的方法是这样的:

>>> start = 'asdf=5;'
>>> end = '123jasd'
>>> s = 'asdf=5;iwantthis123jasd'
>>> print((s.split(start))[1].split(end)[0])
iwantthis

然而,这似乎非常低效且不符合python规则。有什么更好的方法来做这样的事情吗?

忘了说: 字符串可能不是以start和end开始和结束的。他们可能会有更多的字符之前和之后。


当前回答

只是把OP自己的解决方案转换成一个答案:

def find_between(s, start, end):
    return (s.split(start))[1].split(end)[0]

其他回答

import re

s = 'asdf=5;iwantthis123jasd'
result = re.search('asdf=5;(.*)123jasd', s)
print(result.group(1))
s[len(start):-len(end)]
source='your token _here0@df and maybe _here1@df or maybe _here2@df'
start_sep='_'
end_sep='@df'
result=[]
tmp=source.split(start_sep)
for par in tmp:
  if end_sep in par:
    result.append(par.split(end_sep)[0])

print result

必须显示: 这里0,这里1,这里2

regex更好,但它需要额外的库,你可能只想使用python

这是我之前在Daniweb中发布的代码片段:

# picking up piece of string between separators
# function using partition, like partition, but drops the separators
def between(left,right,s):
    before,_,a = s.partition(left)
    a,_,after = a.partition(right)
    return before,a,after

s = "bla bla blaa <a>data</a> lsdjfasdjöf (important notice) 'Daniweb forum' tcha tcha tchaa"
print between('<a>','</a>',s)
print between('(',')',s)
print between("'","'",s)

""" Output:
('bla bla blaa ', 'data', " lsdjfasdj\xc3\xb6f (important notice) 'Daniweb forum' tcha tcha tchaa")
('bla bla blaa <a>data</a> lsdjfasdj\xc3\xb6f ', 'important notice', " 'Daniweb forum' tcha tcha tchaa")
('bla bla blaa <a>data</a> lsdjfasdj\xc3\xb6f (important notice) ', 'Daniweb forum', ' tcha tcha tchaa')
"""

只是把OP自己的解决方案转换成一个答案:

def find_between(s, start, end):
    return (s.split(start))[1].split(end)[0]