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<!DOCTYPE html> <html> <body> <p>The ignoreCase property returns true if the "i" modifier is set, otherwise it returns false.</p> <p>Click the button to check whether or not the "i" modifier is set.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var str = "Visit W3Schools!"; var patt1 = /W3S/i; var res = patt1.ignoreCase; document.getElementById("demo").innerHTML = res; } </script> </body> </html>