\w表示字母数字字符加下划线, \s匹配whitespacecharacter同时 regex还提供了一种特殊的字符 . ,Dotmatchalmostanycharacter, 当然应该尽量少使用 . 在一般情况下字符集或者非字符集(negatedcharacterclass)更快也更精确
regex_match是正则表达式匹配的函数，下面以例子说明。如果想系统的了解，参 考regex_match [cpp] view plain copy 1. // regex_match example 2. #include <iostream> 3. #include <string> 4. #include <regex> 5.6. int main ()7. { 8.9. if (std::regex_match ("subject", std::regex("...
[xyz] Character class matching either x, y or z (union). [^xyz] Character class matching any character except x, y and z. [a-z] Character class matching any character in range a-z. [[:alpha:]] ASCII character class ([A-Za-z]) [[:^alpha:]] Negated ASCII character class ([^...
print Any printable character. punct Any punctuation character. space Any white space character. upper Any upper case character A-Z. Other characters may also be included depending upon the locale. xdigit Any hexadecimal digit character, 0-9, a-f and A-F. word Any word character - all alpha...
[xyz] Character class matching either x, y or z (union). [^xyz] Character class matching any character except x, y and z. [a-z] Character class matching any character in range a-z. [[:alpha:]] ASCII character class ([A-Za-z]) [[:^alpha:]] Negated ASCII character class ([^...
It's essentially one huge 'or' statement, with each item inside of it or'ed together, and any one can fulfill a pattern match. A simple example is [acr]{3}, which is read as "match character in [a,c,r] three times", and would match such strings as "car" and "arr" and "...
我看不懂标签（boost和notepad++在一起）。除此之外：
[[:ascii:]]Any ASCII character [[:blank:]]ASCII tab or space [[:cntrl:]]ASCII/Unicode control characters [[:digit:]]The same as[0-9] [[:graph:]]All "graphical" (printable) ASCII characters [[:lower:]]The same as[a-z]
“matches classes negation”>Any character excepta, bor cc(negation)<><[a-zA-Z]/th>a through or throughZz, inclusive (range)<style=”vertical-align:top; font-weight:normal“ id=”union“[a-d[m-p]]<>/th>a or mA through p: [a-dm-p](union)<>[a-z&&[def]]...
str='Apple'print("The string is : ",str)--'pl'match in stringprint("string.find( str, 'pl') : ",string.find(str,'pl'))--'lua'willnotbe match in stringprint("string.find( str, 'lua') : ",string.find(str,'lua'))--e..match eandany two charactersprint("string.find( 'Hel...