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<!DOCTYPE html> <html> <body> <p>Click the button to do a global search for a "1", followed by zero or one "0" characters.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var str = "1, 100 or 1000?"; var patt1 = /10?/g; var result = str.match(patt1); document.getElementById("demo").innerHTML = result; } </script> </body> </html>