We recommend a website that collects and organizes regular expressions.

A regular expression (regular expression) describes a string matching pattern, it can be used to check whether a string contains a seed string, replace matched substrings, or retrieve substrings that meet certain conditions from a string. A regular expression is a useful tool for processing text. It is useful for verifying user input, searching strings, and resetting text formats in various effective ways.
As you all know, ASP. NET has a RegularExpressionValidator validation control. One of the attributes is to fill in the regular expression you have written as the validation standard.
This foreign website I recommend to you collects regular expressions provided by programmers from all over the world for classified query. For each regular Expression of a class, there are Title, Expression, Description, matches, Non-Matches, and user ratings. Especially convenient. When I use regular expressions for my projects, I usually look at them here.

The URL isHttp://regexlib.com
Hope to help you.