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<!DOCTYPE html> <html> <body> <p>Search for an "e" in the next paragraph:</p> <p id="p01">The best things in life are free!</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { text = document.getElementById("p01").innerHTML; document.getElementById("demo").innerHTML = /e/.exec(text); } </script> </body> </html>