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@NoToJavaScript they are very powerful, and correctly used, very fast but once you go beyond the very simplest they get complex very fast also ;)
And if you do not understand them you can end up with a performance black hole :)
You could use /\D+/.test('498934') == false to check if a string contains only digits. That statement will result to true. /\D+/.test('oijwei3') == false will result to false since the the test argument has letters in them.
random
#jsregularexpression