Validate cron lines (even the ones commented out)

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

Validates - URLs with schemes - http, https and ftp Relative URL starting with / and ../

Match Gmail Email

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...

This is just the demonstration from the front page.

Check for true or false street address format

Validates DateTime of format YYYY-MM-DD hh:mm:ss including Leap Year

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...

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

Check "codice fiscale"

sdfs sdfs FLBREV00022230 dsfsdfs sdfsf FLBREV00022234 In this case is false

Validates a RFC3339 DateTime format. Does not validates the Data

This regex will match any Youtube video ID thrown at it and return one capturing group containing the ID.