The BNF rules from RFC 5322 transformed to PCRE by Nikita Popov and described in the post http://nikic.github.io/2012/06/15/The-true-power-of-regular-expressions.html.

Regex used in Splunk to extract fields from Mikrotik FW. NOTES: Mikrotik must be configured to use "BSD Syslog" format FW rules must add, as log prefix, the action: drop accep...

Allows inserting expiry date as MM/YYYY or MM-YYYY format

relative to absolute

IOS3166 Country Code Identification REGEX

http://stackoverflow.com/questions/2362985/verifying-a-cron-expression-is-valid-in-java

Matches all valid IP addresses from 0.0.0.0 to 255.255.255.255

Oltre a supportare le omocodie controlla in modo restrittivo il carattere relativo al mese di nascita

if you are as lazy as me and want to replace every "=$_POST['name'];" using Dreamweaver or any development tool that allows using regular expressions to search in current file/document.

Form Tag

Pattern matching and extracting color code formats using RegEx. https://github.com/Kyza/color-regex/

Find and extract email domain. Ex: test@example.pt -> extract 'example.pt'

This regex should extract the subdomain, if any, or the domain, if no subdomain is used, from an arbitrary URL