SQL RegEx : Predefined Character classes

Most of RegEx engines support a good number of predefined character classes. These are kind of shortcuts to the widely used character classes.

These predefined¬†Character classes start with “\” followed by a character.

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Here is the list of most common predefined character classes-

Predefined Character class Equivalent to Meaning
\d [0-9] Digit
\D [^0-9] Non Digit
\s [\t\n\f\r\X0B] White space
\S [^\t\n\f\r\X0B] Not White space
\w [a-zA-Z0-9_] Word char (including underscore)
\W [^a-zA-Z0-9_] Non word char
\b Word boundary (Black space or special character)
\B Non Word boundary



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