Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var text = "f123-41.png";
  };
</script>

Test runner

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/^f[0-9]{1,3}-[0-9]{1,3}\.(png|jpg)$/.test(text);

/^f[0-9]{1,3}-[0-9]{1,3}\.(?:png|jpg)$/.test(text);

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