If the specified pattern is not found inside the target string, then the string is not split in any way, but the split method still generates a list since this is the way it’s designed. However, the list contains just one element, the target string itself. Regex example to split a st...
如果你想定位 string 的任何位置,使用 search() 来替代(也可参考 search() vs. match()) re.fullmatch(pattern, string, flags=0) 如果整个 string 匹配到正则表达式样式,就返回一个相应的 匹配对象。 否则就返回一个 None ;注意这跟零长度匹配是不同的。 3.4 新版功能. re.split(pattern, string, maxsp...
string = 'Twelve:12 Eighty nine:89 Nine:9.' pattern = '\d+'# maxsplit = 1# split only at the first occurrence result = re.split(pattern, string, 1) print(result)# 输出: ['Twelve:', ' Eighty nine:89 Nine:9.'] 顺便说一下,maxsplit默认值为0;默认值为0。意味着拆分所有匹配的结果。
re.split方法 re.split的使用方法是re.split(pattern, string),返回分割后的字符串列表。re.split方法并不完美,比如下例中分割后的字符串列表首尾都多了空格,需要手动去除。 >>> string1 = "1cat2dogs3cats4" >>> import re >>> list1 = re.split(r'\d+', string1) >>> print(list1) ['', ...
compile(pattern, flags=0) 给定一个正则表达式 pattern,指定使用的模式 flags 默认为0 即不使用任何模式,然后会返回一个 SRE_Pattern (参见第四小节 re 内置对象用法) 对象 regex = re.compile(".+")printregex#output> <_sre.SRE_Pattern object at 0x00000000026BB0B8> ...
string.For each match,the iterator returns a match object.Empty matches are includedinthe result."""return_compile(pattern,flags).finditer(string) 大家可能注意到了另一个参数 flags,在这里解释一下这个参数的含义: 参数flag 是匹配模式,取值可以使用按位或运算符’|’表示同时生效,比如 re.I | re.M。
def split(self, string, maxsplit=0): """Split string by the occurrences of pattern.""" # 返回根据匹配到的的子串将字符串分割后成列表 pass #参数说明 #maxsplit: 指定最大分割次数,不指定将全部分割。 举例: import re pattern = re.compile(r'\d+') m = pattern.split('a1b2c3d4e') pri...
search Search a string for the presence of a pattern. sub Substitute occurrences of a pattern found in a string. subn Same as sub, but also return the number of substitutions made. split Split a string by the occurrences of a pattern. ...
RegEx Functions Theremodule offers a set of functions that allows us to search a string for a match: FunctionDescription findallReturns a list containing all matches searchReturns aMatch objectif there is a match anywhere in the string splitReturns a list where the string has been split at each...
If maxsplit is nonzero, at most maxsplit splits occur, and the remainder of the string is returned as the final element of the list.""" return _compile(pattern, flags).split(string, maxsplit) def sub(pattern, repl, string, count=0, flags=0): """Return the string obtained by ...