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RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
Cash App - The easy way to send, spend, bank, and invest.
Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
Facebook Pay - Send money to your friends via Messenger
regular expressions 101 - Extensive regex tester and debugger with highlighting for PHP, PCRE, Python and JavaScript.
PayPal.Me - Request money using your own personalized URL.