正则表达式(Regular Expression)通常被用来检索、替换那些符合某个模式(规则)的文本。 此处的Regular即是规则、规律的意思,Regular Expression即“描述某种规则的表达式”之意。 本文收集了一些常见的正则表达式用法,方便大家查询取用,并在最后附了详细的正则表达式语法手册。 案例包括:「邮箱、身份证号、手机号码
There are some predefined character classes. The \s matches a whitespace character [\t\n\t\f\v], the \d a digit [0-9], and the \w a word character [a-zA-Z0-9_]. named_character_class.py #!/usr/bin/python import re text = 'We met in 2013. She must be now about 27 ...
Inside the regular expression, a dot operators represents any character except the newline character, which is\n. Any character means letters uppercase or lowercase, digits 0 through 9, and symbols such as the dollar ($) sign or the pound (#) symbol, punctuation mark (!) such as the que...
Write a Python program to split a string with multiple delimiters. Note : A delimiter is a sequence of one or more characters used to specify the boundary between separate, independent regions in plain text or other data streams. An example of a delimiter is the comma character, which acts ...
\sReturns a match where the string contains a white space character"\s"Try it » \SReturns a match where the string DOES NOT contain a white space character"\S"Try it » \wReturns a match where the string contains any word characters (characters from a to Z, digits from 0-9, an...
Matching types of character Character classes Repetition Capturing, alternation & backreferences Lookahead Literal matches and modifiers Unicode Regular expressions (regex or regexp) are a pattern of characters that describe an amount of text. Regular expressions are one of the most widely used tools ...
Here, even though 'bar' does occur at the start of the substring beginning at character 3, it isn’t at the start of the entire string, so the caret (^) anchor fails to match.The following methods are available for a compiled regular expression object re_obj as well:...
正则表达式(Regular Expression)通常被用来检索、替换那些符合某个模式(规则)的文本。 此处的Regular即是规则、规律的意思,Regular Expression即“描述某种规则的表达式”之意。 本文收集了一些常见的正则表达式用法,方便大家查询取用,并在最后附了详细的正则表达式语法手册。
Metacharacters are not active inside classes. For example,[akm$]will match any of the characters'a','k','m', or'$';'$'is usually a metacharacter, but inside a character class it’s stripped of its special nature. You can match the characters not listed within the class bycomplementing...
64 元类(Metaclasses): 用来定义某些类是如何被创建的, 默认使用的元类是type, 元类就是类的类64.1 创建一个类的时候, 解释器需要知道这个类的正确的元类, 解释器首先寻找雷属性__metaclass__, 如果属性不存在, 继续查找继承树中类的__metaclass__属性, 如果还是没有发现该属性, 就会检查名字为__metaclass_...