Email - Works 99% close to oficial Standards, even better

Testing all known Variations of Instagram Profile Url's

LinkedIn Profile Url

only lat and cyr letters

Match all filenames in any URL including those with ANSI escaped characters (dotNET version)

ipv4 with optional port

No leading or trailing spaces

An email regex that allows for capitals after the final dot (ie. TEST@GMAIL.COM)

时间

(\+977)?9\d{8}

Pattern matches to all illegal characters in directory name. Can be useful for normalizing the folder name before creating it

Guid parser

Inverts the 2 attributes

2135

This checks the syntax for CRON

Matches with Bangladeshi Mobile and Telephone Numbers

Regex for validating ISO 8601:2004E durations, complete with named capture groups.

Validates IPv4 Address for Java

Formats jdbc:postgresql:database jdbc:postgresql:/ jdbc:postgresql://host/database jdbc:postgresql://user:password@host/database...

Flexible postcode validation with or without space as outlined here, but added optional space for flexibility https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/488478/Bulk_Data_Transfer_-_additional_validation_valid_from_12_November_2015.pdf