MasterCard - ^5[1-5]\d+ Visa - ^4\d+ Amex - ^3[47]\d+ Discover - 6011|65|64...

Created for purpose of reading an INI file in C# applications. Supports comments and comment escape characters. I plan to add more escape characters (such as \=). s - Section scp - Section Comment Prefix sc - Section Comment...

Matches any valid JSON object, matches recursively. Passes all JSON test cases I found.

Use this regex to select all characters up to the "" bracket. It works across multiple lines. You can get an email list with only the IDs. This is the pattern it matches: Alpha Person Step 1 (.*) [$ Step 2 [$.$] (.*) gives you aperson@whatever.org...

global modifier

By Using this string you can just remove ascii special characters from a unicode string characters like ♥♥♥♥ ▓▒ and other non unicode letters.

1-15 alphanumeric login name

A quite neat regular expression for URLs, e-mails..., I found on Matthew O'Riordan's blog.

Check for true or false street address format

Valid PHP variable name as defined in the manual at http://php.net/manual/en/language.variables.basics.php

grabs the ID for the regex101.com permalink to code

From 1970 to 2015 Replace: (\d{4})$ for (19[7-9]\d|200-1)$

Alow alphanumeric characters and spaces