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<!DOCTYPE html> <html> <body> <p>Click the button to alert the string with removed whitespace.</p> <button onclick="myFunction()">Try it</button> <script> function myTrim(x) { return x.replace(/^\s+|\s+$/gm,''); } function myFunction() { var str = myTrim(" Hello World! "); alert(str); } </script> </body> </html>