它们具有高度的灵活性,可用于广泛的任务,从简单搜索到高级文本处理。 Python有一个专门用于处理正则表达式的包叫做re。它包含不同的函数,如 .search()、.split()、.findall()、.sub() 等。 从一些基本的正则表达式语法开始,这些是构建更复杂模式的基础。 元字符(Metacharacters) 元字符(Metacharacters)是在正则表达...
re.escape(pattern) 转义pattern 中的特殊字符。如果你想对任意可能包含正则表达式元字符的文本字符串进行匹配,它就是有用的。比如 >>> 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>> print(re.escape('http://www.python.org')) http://www\.python\.org >>> legal_chars = string.ascii...
CharacterDescriptionExampleTry it []A set of characters"[a-m]"Try it » \Signals a special sequence (can also be used to escape special characters)"\d"Try it » .Any character (except newline character)"he..o"Try it » ^Starts with"^hello"Try it » ...
Backlash\is used to escape various characters including all metacharacters. For example, \$amatch if a string contains$followed bya. Here,$is not interpreted by a RegEx engine in a special way. If you are unsure if a character has special meaning or not, you can put\in front of it. T...
CharacterDescriptionExampleTry it [] A set of characters "[a-m]" Try it » \ Signals a special sequence (can also be used to escape special characters) "\d" Try it » . Any character (except newline character) "he..o" Try it » ^ Starts with "^hello" Try it » $ Ends...
\s - Matches where a string contains any whitespace character. Equivalent to [ \t\n\r\f\v].ExpressionStringMatched? \s Python RegEx 1 match PythonRegEx No match\S - Matches where a string contains any non-whitespace character. Equivalent to [^ \t\n\r\f\v]....
(match, string, flags=0) --match# re.findall(pattern, string flags=0) --list# re.finditer(pattern, string, flags=0) --iterator# re.sub(pattern, repl, string, count=0, flags=0) --str# re.subn(pattern, reple, string, count=0, flags=0) --tuple# re.escape(pattern) --...
str1 ="Emma is a Python developer. Emma salary is 5000$. Emma also knows ML and AI."# escape dotres = re.findall(r"\.", str1) print(res)# Output ['.', '.', '.'] Run The[]square brackets metacharacter The square brackets are beneficial when used in the regex pattern because...
Special character escapes are much like those already escaped in Python string literals. Hence regex '\n' is same as regex '\\n': \a ASCII Bell (BEL) \f ASCII Formfeed \n ASCII Linefeed \r ASCII Carriage return \t ASCII Tab
EN文本数据操作和处理可以从使用 Python 程序中受益，该程序将从字符串中消除最后一个指定的字符。此类...