因此，例如，要匹配由一个或多个字母A-Z后跟两个或四个数字组成的字符串，可以写^[A-Z]+(?:\d{...
(?<zip>\d{5}(-\d{4})?) Match five numeric digits followed by either zero or one occurrence of a hyphen followed by four digits. Assign this captured group the name zip. Remarks A regular expression pattern may contain either named or numbered capturing groups, which delineate subexpressions...
function test(str) { const rex = /(?<!paragraph *(?:[\(\)0-9a-zA-Z]+\.)*)(?:[\(\)0-9a-zA-Z]+\.){1,4}[\(\)0-9a-zA-Z]/i; const match = rex.exec(str); console.log(match ? match[0] : "No match"); } console.log("Testing four 'digits':"); test("Don't ...
To match four digits in a row, we can write: \d{4} and our whole pattern becomes: ^ # beginning of string \d{3} # three digits - # literal '-' \d{2} # two digits - # literal '-' \d{4} # four digits $ # end of string Whether that is preferable to the previous choice...
regex_match 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", ...
Digits four and five are called the group number and range from 01 to 99. The last four digits are serial numbers from 0001 to 9999. To validate all the above 3 rules, our regex would be: Regex : ^(?!000|666)[0-8][0-9]{2}-(?!00)[0-9]{2}-(?!0000)[0-9]{4}$ ...
\wBackslash and w, it is equivalent to [a-zA-Z0-9_], matches alphanumeric character or underscore. Conversely, Capital\Wwill match non-alphnumeric character and not underscore. \dBackslash and d, matches digits 0 to 9, equivalent to [0-9] or [:digit] ...
– This is an optional group that can match a plus sign along with 0-3 digits. But since there is a question mark before the plus sign as well as the entire group, it means that it will match an empty string, a plus sign with up to three numbers, or just up to three numbers. ...
\u007F Hex character code (exactly four digits) \u{7F} Hex character code corresponding to a Unicode code point \U0000007F Hex character code (exactly eight digits) \U{7F} Hex character code corresponding to a Unicode code point \p{Letter} Unicode character class \P{Letter} Negated Unicod...
both match “gray” or “grey” [ ] Matches a single character that is contained within the brackets [abc] matches “a”, “b”, or “c” gr[ae]y matches “gray” or “grey”, but not “graey”, “graay”, etc. [a-z] ...