\d match any 0-9 number (\D match any non-digit character) . match any single charcter ("\." match ".") [a,b,c] match a, b, or c [^a,b,c] match any except a,b,nor c [a-z] match any single charcter from a to z [0-9] match any single digit number from 0 to 9...
[arn]Returns a match where one of the specified characters (a,r, orn) is presentTry it » [a-n]Returns a match for any lower case character, alphabetically betweenaandnTry it » [^arn]Returns a match for any character EXCEPTa,r, andnTry it » ...
all the characters that arenotin the set will be matched. For example,[^5]will match any character except'5', and[^^]will match any character except'^'.^has no special meaning if it’s not the first character in the set.(补集)[^1-9]除去1到9...
. Matches any character except newline 匹配任意一个字符(除了换行符之外\n) a Matches exactly one character a 匹配字符a xy Matches the string xy 匹配字符串xy a|b Matches expression a or b. If a is matched first, b is left untried. 匹配表达式a或者表达式b,如果表达式a匹配成功,则表达式b不...
Regex.dot metacharacter 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 ($) sign or the pound (#) symbol, punctuation mark...
\$amatch if a string contains$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. This makes sure the character is not treated in a special way. ...
正则表达式,又成正规表示式,正规表示法,正规表达式,规则表达式,常规表示法(英语:Regular Expression,在代码 中常简写为regex、regexp或RE),是计算机科学的一个概念,正则表达式使用带个字符串来描述,匹配一系列匹配某个句 法规则的字符串,在很多文本编辑器里,正则表达式通常被用来检索,替换那些匹配某个模式的文本。
. Match any char except newline, see re.DOTALL ^ Match start of the string, see re.MULTILINE $ Match end of the string, see re.MULTILINE [] Enclose a set of matchable chars R|S Match either regex R or regex S. () Create capture group, & indicate precedence ...
A period matches any single character (except newline '\n').ExpressionStringMatched? .. a No match ac 1 match acd 1 match acde 2 matches (contains 4 characters)^ - CaretThe caret symbol ^ is used to check if a string starts with a certain character.ExpressionStringMatched? ^a a 1 ...
[^abc] Negation, matches everything except a, or b, or c. \s Matches white space character. \w Matches a word character; equivalent to [a-zA-Z_0-9]The regex functionsWe look for matches with regex functions. FunctionDescription match Determines if the RE matches at the beginning of ...