importredefis_not_contain(string,pattern):regex=fr"(?<!{pattern}).*"match=re.match(regex,string)returnmatchisnotNone 1. 2. 3. 4. 5. 6. 上述代码定义了一个函数is_not_contain,它接受两个参数:string是要判断的字符串,pattern是要排除的字符串。函数内部使用了re.match来匹配字符串,并返回匹配结果。
\DReturns a match where the string DOES NOT contain digits"\D"Try it » \sReturns a match where the string contains a white space character"\s"Try it » \SReturns a match where the string DOES NOT contain a white space character"\S"Try it » ...
\D Returns a match where the string DOES NOT contain digits "\D" Try it » \s Returns a match where the string contains a white space character "\s" Try it » \S Returns a match where the string DOES NOT contain a white space character "\S" Try it » \w Returns a match ...
or affect how the regular expressions around them are interpreted.Regular expression pattern strings may not contain null bytes, but can specify the null byte using the\numbernotation, e.g.,'\x00'.
text="Learning Python is fun!"substring="Python"iftext.find(substring)!=-1:print(f'"{text}" contains "{substring}"')else:print(f'"{text}" does not contain "{substring}"') Copy 3. How to perform a case-insensitive string check?
Normally the carat sign is used to match the pattern only at the beginning of the string as long as it is not a multiline string meaning the string does not contain any newlines. However, if you want to match the pattern at the beginning of each new line, then use there.Mflag. There...
series.replace(to_replace='None', value=np.nan, inplace=True, regex=False) # 下面两种都是对的,要注意不能串 df_X = df_X.replace([np.inf, -np.inf], np.nan).copy() df_X.replace([np.inf, -np.inf], np.nan, inplace=True) ...
Here, captured groups 1 and 2 contain 'foo' and 'qux'. In the replacement string '\2,bar,baz,\1', 'foo' replaces \1 and 'qux' replaces \2.You can also refer to named backreferences created with (?P<name><regex>) in the replacement string using the metacharacter sequence \g<...
(regex,"June 24")# This will print [0, 7), since it matches at the beginning and end of the# stringprint("Match at index %s, %s"% (match.start(), match.end()))# The groups contain the matched values. In particular:# match.group(0) always returns the fully matched string# ...
Python is not so exceptional in this regard, though if you're used to JavaScript, Ruby, Perl, and others, you may be surprised to find that Python doesn't have regex literals. The regex functionally is all encapsulated in the re module. (The official docs have a regex HOWTO, which is...