Info

Split a string to retrieve number at beginning

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    str = "1000: rest of string";
  };
</script>

Test runner

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str.split(":")[0];

str.replace(/^(\d+):.+$/, '$1');

str.substring(0, str.indexOf(":"))

str.substring(0,str.search(':'))

str.match( /\d+/ig);

str.match(/^(\d*):\s/)[1]

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