Grabs the ID for the regex101.com permalink code. If a revision number is provided, grab that as well.

Trim leading and trailing whitespace from a string.

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.

Detects most of the phone numbers all over the world

Validate and capture dateTime parts, includes validation for leap years, range 1000-2999. Fixed bug

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

Checks that a password has a minimum of 6 characters, at least 1 uppercase letter, 1 lowercase letter, and 1 number with no spaces.

Matches distorted email addresses and converts them back to real ones.

Email address, most used cases

Attempts to mimic Google search box behavior, returning an array with the separated search strings (that keep the +/- indicator for following operations)

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

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

1-15 alphanumeric login name

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

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

Matches single or double quoted strings, and ignores backslash-escaped quotes within the string.

general purpose HTTP URL regex

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

Captures all fields from a CSV file's line. Can be customized with user-defined field separator and protecting character.

Matches text within quotes (", ') and escapes the charecters.

Complete url matching with storage of various parameters

grabs the ID for the regex101.com permalink to code

Besides leap year handling, this takes care of date validation in the yy-mm-dd format.

Checks for valid UK/British postcodes. There was another on here that had for some reason been upvoted, but it was actually incorrect as it worked on none of my valid own postcodes! Namely that it assumed two letters and a number (BS3) when you can have variations (M20). Allows for an optional space and separates the two parts into groups.

For Validating alphanumeric and numeric range

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

A string with only numbers in

Validate Gregorian calendar dates that contain 24-hour times. This will also correctly match the Feb 29 date when it falls on a valid leap year. Leap years occur every 4 years, with one exception: when a year is evenly divisible by 100 but not evenly divisible by 400, the year will not be a leap year. Thus years 2100, 2200, and 2300 are not leap years but years 2000, 2400, and 2800 are.

this regex is support for all languages

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

Verifies Number is a negative/positive number. Number may be a decimal, but if it is, it requires at least one number before and after the decimal place. Decimal numbers may also be negative or positive. Only 1 decimal place is allowed.

Matches IP Addresses with minimum false positives

Simple name matching Matches english names only, you may add international characters to list of characters.

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)

{1:aa,2:bb,3:"aa:bb"}

Simple regular expression for extracting attribute value of the element in XML-string. Attribute value should be in quotes.

This regex is used to remove HTML tag on string

Replace non-ending string \n by the HTML tag

Capture comma separated numbers, no matter if there are spaces before or after the commas.