grabs the ID for the regex101.com permalink to code

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.

trim string

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

Detects most of the phone numbers all over the world

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

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

Validates IPv4 IP Address

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

Email address, most used cases

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

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

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

1-15 alphanumeric login name

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 spac...

From a (fairly large) list of User Agent strings, extract the OS, Browser, and Device Type.