^ regex meaning code example

Example 1: Define REGEXP?

REGEXP is a pattern match in which matches pattern anywhere in the search value.

Example 2: regular expression characters

/* shorthand character classes */
regex = /d/; // matches any digit, short for [0-9]
regex = /D/; // matches non-digits, short for [^0-9]
regex = /S/; // matches non-white space character
regex = /s/; // matches any white space character
regex = /w/; // matches character, short for [a-zA-Z_0-9]
regex = /W/; // matches non-word character [^w]
regex = /b/; // Matches a word boundary where a word character is [a-zA-Z0-9_]

Example 3: regular expression

|\b0*([a-zA-Z1-9][a-zA-Z0-9]*|0)\b$