\seval\(base64_decode\(?\)\);

SQL injection regEx pattern

matches normal email addresses like example@gmail.com but also addresses with ip addresses like example@192.168.0.34 (not ipv6)

Regex to constrain a text to have at least 2 strings. Compatible with 2nd-3rd-Nth names/surnames.

Use this Regex for server-side validation also with some slight modifications like so for .NET -- @\w+([-+.']\w+)@\w+([-.]\w+)\.[a-zA-Z0-9]{2,6}(-.{2,6})*;

This regex matches roman numbers from 1 (I) to 3999 (MMMCMXCIX)

matches 123.4f 123.4F .4f .4F 5f 5F

Value must be either true or false

matches only those commas that are between sets, or between members of a set. does not match commas that are inside members.

Validates Multiple email addresses seperated by comma.

Awesome explanation of nested lookbacks

Validating comma delimited strings for whitespaces & extra commas -- +(,()+){0,}

a simple username pattern

In between 2 delimiters

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-2.02^3(2+3.024)+3.14159-(45^23)/(19-4)