php-regexHow to use PHP regex to match a hexadecimal?
Using PHP regex to match a hexadecimal is quite simple. The following example code block will match a hexadecimal string of any length:
$hexadecimal = preg_match('/^[0-9A-Fa-f]+$/', $string);The output of the above code will be 1 if the string is a valid hexadecimal, and 0 if it is not.
Code explanation
/^: This is the start of the regular expression.[0-9A-Fa-f]: This is the character class that matches any hexadecimal character.+: This is a quantifier that matches one or more of the preceding character class.$/: This is the end of the regular expression.
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