RegExp /[a-z]/i vs /[a-zA-Z]/

JavaScript performance comparison

Test case created by Rob W

Preparation code

<script>
  var string = new Array(1000).join("aAbB");
  var regWithI = /[a-z]/i;
  var regAZ  = /[A-Za-z]/;
</script>

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Testing in unknown unknown
Test Ops/sec
With i-flag
string.match(regWithI);
pending…
Without i-flag
string.match(regAZ);
pending…

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