Regular expressions are patterns used to match character combinations in strings. In JavaScript, regular expressions are also objects. These patterns are used with the exec and test methods of RegExp, and with the match, replace, search, and split methods of String. This chapter describes JavaScript regular expressions.
| . | any character except newline |
|---|---|
| \w\d\s | word, digit, whitespace |
| \W\D\S | not word, digit, whitespace |
| [abc] | any of a, b, or c |
| [^abc] | not a, b, or c |
| [a-g] | character between a & g |
| ^abc$ | start / end of the string |
|---|---|
| \b\B | word, not-word boundary |
| \.\*\\ | escaped special characters |
|---|---|
| \t\n\r | tab, linefeed, carriage return |
| (abc) | capture group |
|---|---|
| \1 | backreference to group #1 |
| (?:abc) | non-capturing group |
| (?=abc) | positive lookahead |
| (?!abc) | negative lookahead |
| a*a+a? | 0 or more, 1 or more, 0 or 1 |
|---|---|
| a{5}a{2,} | exactly five, two or more |
| a{1,3} | between one & three |
| a+?a{2,}? | match as few as possible |
| ab|cd | match ab or cd |
Ref: Developer Mozilla
Ref: Regexr
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