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Asked: 2026-05-10T23:55:19+00:00

The monthRegex regular expression always returns true, even if dateInput is something like December

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The monthRegex regular expression always returns true, even if dateInput is something like ‘December 1, 2008’ by my thoughts it should match a regular expression by whichever key I pass into it. But that isn’t what happens, it just returns true, and detects ‘JAN’ as the month.

    function dateFormat(dateInput) {      var formattedDate = '';      var the_date, month, year;      var monthHash = new Array();     monthHash['JAN']='01';     monthHash['FEB']='02';     monthHash['MAR']='03';     monthHash['APR']='04';     monthHash['MAY']='05';     monthHash['JUN']='06';     monthHash['JUL']='07';     monthHash['AUG']='08';     monthHash['SEP']='09';     monthHash['OCT']='10';     monthHash['NOV']='11';     monthHash['DEC']='12';      // Find which month we are dealing with     var whichKey = null;      for(var key in monthHash) {           var monthRegex = new RegExp(key, 'i')         monthRegex.compile();          console.log('monthRegex.compile: ' + monthRegex.test(dateInput));          if(monthRegex.test(dateInput))         {             whichKey = key;             break;         }     } }

Thank you,
  Andrew J. Leer

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1 Answer

  1. Remove the ‘monthRegex.compile();’ line and it works.

    This is because monthRegex.compile(); complies ” as a regex and therefore everything matches it.

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