JavaScript Regular Expressions

.   find a single character, except newline or line terminator \w   find a word character \W   find a non-word character \d   find a digit \D   find a non-digit character \s   find a whitespace character \S   find a non-whitespace character \b   find a match at the beginning/end of a word \B   find a match, but not at the beginning/end of a word \0   find a NULL character

Metacharacters Playground

\d

The \d metacharacter matches digits from 0 to 9.

Press the Tab key in order to move faster through the form when exercising.
[Click me to toggle the popup tip] A word character is a character a-z, A-Z, 0-9, including _ (underscore).

Try the following examples first. Then, create your own and exercise.

Character pattern: "Cute cat" Has 4 _legs, And a weird (%6& 99+_] character."
Metacharacter patterns: \d, \d\d, \d..\d, .\d, \d+

Note: Commas are not parts of the patterns.

You will see the result here