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<!DOCTYPE html> <html> <body> <p>Click one of the buttons to perform a search for the characters "THIS" in a string.</p> <button onclick="myFunction()">Global case-sensitive search</button> <button onclick="myFunction2()">Global case-insensitive search</button> <p id="demo"></p> <script> function myFunction() { var str = "THIS This this"; var patt1 = /[THIS]/g; var result = str.match(patt1); document.getElementById("demo").innerHTML = result; } </script> <script> function myFunction2() { var str = "THIS This this"; var patt1 = /[THIS]/gi; var result = str.match(patt1); document.getElementById("demo").innerHTML = result; } </script> </body> </html>