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<!DOCTYPE html> <html> <body> <h1>JavaScript Regular Expression</h1> <h2>The ? Quantifier</h2> <p>A global search for a "1", followed by zero or one "0" characters:</p> <p id="demo"></p> <script> let text = "1, 100 or 1000?"; let pattern = /10?/g; let result = text.match(pattern); document.getElementById("demo").innerHTML = result; </script> </body> <!-- /jsref/tryit.asp?filename=tryjsref_regexp_zeroone </html>
