Multiline:多行模式,^ 行首,$行尾 re.M IgonrePatternWhitespace:忽略表达式中的空白字符,否则需要转义 re.X 单行模式: . 可以匹配所有的字符,包括换行符 ^ 表示整个字符串的开头,$整个字符串的结尾 多行模式: . 可以匹配除换行符外所有的字符,包括换行符 ^ 表示行的开头,$整个行的结尾 开头:\n后紧接着...
regex用\m表示单词起始位置,用\M表示单词结束位置。 (?|...|...) 重置分支匹配中的捕获组编号。 >>> regex.match(r"(?|(first)|(second))","first").groups() ('first',)>>> regex.match(r"(?|(first)|(second))","second").groups() ('second',) 两次匹配都是把捕获到的内容放到编号为1...
negative lookbehind to avoid trailing whitespace 在python程序的上下文中,我们通常将类似于这样的正则表达式写在原始的三引号字符串中——原始,所以不需要双写反斜线;三引号,所以可以跨越多行。 除前面讨论的断言外,还有一些附加的断言——这些断言可以査看断言前(后) 的...
A = <RegexFlag.ASCII: 256> ASCII = <RegexFlag.ASCII: 256> DOTALL = <RegexFlag.DOTALL: 16> I = <RegexFlag.IGNORECASE: 2> IGNORECASE = <RegexFlag.IGNORECASE: 2> L = <RegexFlag.LOCALE: 4> LOCALE = <RegexFlag.LOCALE: 4> M = <RegexFlag.MULTILINE: 8> MULTILINE = <RegexFlag.MULTI...
RegexLexerfrom pygments.token import *class MyLexer(RegexLexer): name = 'MyLexer' tokens = { 'root': [ (r'\d+', Number), (r'[a-zA-Z]+', Name), (r'#.*', Comment), (r'\s+', Whitespace) ] } 在这个例子中，我们创建了一个名为MyLexer的新Lexer，...
整理用户输入的问题在编程过程中极为常见。通常情况下,将字符转换为小写或大写就够了,有时你可以使用正则表达式模块「Regex」完成这项工作。但是如果问题很复杂,可能有更好的方法来解决: user_input = "This\nstring has\tsome whitespaces...\r\n"
re.VERBOSEXre.XAllows whitespaces and comments inside patterns. Makes the pattern more readableTry it » Special Sequences A special sequence is a\followed by one of the characters in the list below, and has a special meaning: CharacterDescriptionExampleTry it ...
and punctuation") for sentence in tqdm(sentence_list): sent = _replace_urls(sentence) sent = _simplify_punctuation(sentence) sent = _normalize_whitespace(sent) norm_sents.append(sent) return norm_sentsdef _replace_urls(text): url_regex = r'(https?:\/\/(?:www\....
compile(r""" $ # end of line boundary \s{1,2} # 1-or-2 whitespace character, including the newline I # a capital I [tT][eE][mM] # one character from each of the three sets this allows for unknown case \s+ # 1-or-more whitespaces INCLUDING newline \d{1,2} # 1-or-2 ...
This example uses the following file,regexspaces.py, to show some ways you can use regex to remove whitespace characters: regexspaces.py importre s=' Hello World From DigitalOcean \t\n\r\tHi There 'print('Remove all spaces using regex:\n',re.sub(r"\s+","",s),sep='')# \s match...