A neat regular expression to extract web urls and emails from a paragraph or a text stream.

获取前后各有一个数字，中间的数字

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

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

Validates IPv4 Address for Java

(^([0-9]{2,3}.)([0-9]{2,3}.)([0-9]{2,3}.)([0-9]{2,3})$)

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

Regex for parsing markdown link. Named group "text", "url" and "alt.

Matches with Bangladeshi Mobile and Telephone Numbers

This checks the syntax for CRON

2135

Inverts the 2 attributes

Guid parser

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

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

时间

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

No leading or trailing spaces

ipv4 with optional port

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