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

Matches case insensitive first name, optional unlimited number of middle names and last name separated with space format. Replaced \w with explicit char range for Turkish support. (Äž accepted as first char not to over complex)

Find " and ' quoted strings and "orphaned"/single words in a string

general purpose HTTP URL regex

Safe Password that allow only with a number, a lowercase, a uppercase, and a special character

grabs the ID for the regex101.com permalink to code

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

Allows phone numbers with optional country code, optional special characters and whitespace

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

Alow alphanumeric characters and spaces

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

checks for valid PAN card for Indian users.

Usually MSWord HTML exports

It correctly handles simple values, empty values, and quoted values with commas inside.

Useful to work with GoogleMap API.