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<!DOCTYPE html> <html> <body> <p>Click the button to global search for a substring that contains a sequence of three to four digits.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var str = "100, 1000 or 10000?"; var patt1 = /\d{3,4}/g; var result = str.match(patt1); document.getElementById("demo").innerHTML = result; } </script> </body> </html>