Your regular expression
/
/
Your test string
Match result
| \b | Any word boundary character | . | Any single character | (a|b) | a or b |
| \s | Any whitespace character（[ \f\n\r\t\v]） | ^ | Start of line | a? | Zero or one of a |
| \d | Any digit（[0-9]） | $ | End of line | a* | Zero or more of a |
| \D | Any non-digit（[^0-9]） | [abc] | A single character | a+ | One or more of a |
| \w | Any word character（[A-Za-z0-9_]） | [^abc] | Any single character | a{3} | Exactly 3 of a |
| \W | Any non-word character | [a-z] | Any single character in the range a-z | a{3,6} | Between 3 and 6 of a |