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" character_map = { ord('\n') : ' ', ord('\t') ...
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 ...
# ^(caret)# anchor 的一种,指定匹配的位置(at the start of the string)# 如果你想要确认一段文本或者一个句子是否以某些字符打头,那么^ 是有用的print(re.search(r"^regex","regex is powerful").group())# 而下面这行代码就会报错 :NoneType' object has no attribute 'group'# print(re.search("^...
re.UNICODEre.UReturns Unicode matches. This is default from Python 3. For Python 2: use this flag to return only Unicode matchesTry it » re.VERBOSEre.XAllows whitespaces and comments inside patterns. Makes the pattern more readableTry 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\....
python的正则表达式re、regex模块 该模块提供了与Perl中类似的正则表达式匹配操作。就其本质而言,正则表达式(或re)是一种小型的、高度专业化的编程语言。正则就是用一些具有特殊含义的符号组合到一起(称为正则表达式)来描述字符或者字符串的方法。或者说:正则就是用来描述一类事物的规则。(在python中)它内嵌在python中...
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 string has somewhitespaces... " character_map = { ...
正则表达式(regular expression,简称regex),是一种字符串匹配的模式(pattern),是文本处理方面功能最强大的工具之一,主要用来完成文本的搜索、替换等操作。广泛运用于PHP、C# 、Java、C++ 、Perl 、VBScript 、Javascript、以及Python等,在代码中常简写为regex、regexp或re。
We look for matches with regex functions. FunctionDescription match Determines if the RE matches at the beginning of the string. fullmatch Determines if the RE matches the whole of the string. search Scans through a string, looking for any location where this RE matches. findall Finds all sub...