python中re.findall函数实例用法

import re
lst = re.findall("[1-9]\d*","qw21313h1o58p4kjh8123jkh8435u")
for x in lst:
 print(x,end=" ")

findall(pattern, string, flags=0)
 Return a list of all non-overlapping matches in the string.
 If one or more capturing groups are present in the pattern, return
 a list of groups; this will be a list of tuples if the pattern
 has more than one group.
 Empty matches are included in the result.

import re
kk = re.compile(r'\d+')
kk.findall('one1two2three3four4')
#[1,2,3,4]
 
#注意此处findall()的用法，可传两个参数;
kk = re.compile(r'\d+')
re.findall(kk,"one123")
#[1,2,3]

import re
string="abcdefg  acbdgef  abcdgfe  cadbgfe"
#带括号与不带括号的区别
#不带括号
regex=re.compile("((\w+)\s+\w+)")
print(regex.findall(string))
#输出：[('abcdefg  acbdgef', 'abcdefg'), ('abcdgfe  cadbgfe', 'abcdgfe')]
regex1=re.compile("(\w+)\s+\w+")
print(regex1.findall(string))
#输出：['abcdefg', 'abcdgfe']
regex2=re.compile("\w+\s+\w+")
print(regex2.findall(string))
#输出：['abcdefg  acbdgef', 'abcdgfe  cadbgfe']