Why does checking this string with Regex.IsMatch cause CPU to reach 100%?

Question

When using Regex.IsMatch (C#, .Net 4.5) on a specific string, the CPU reaches 100%.

String:

https://www.facebook.com/CashKingPirates/ph         


        

Answer 1

Your regex suffers for catastrophic backtracking.You can simply use

^http(s)?://([\w.-])+(/[\w ./?%&=-]+)*$

See demo.

https://regex101.com/r/cK4iV0/15