Combining regular expressions in Javascript

The answer is yes! You have to initialize the variable under the RegExp class:

var lower = new RegExp(/--RegexCode--/);
var upper = new RegExp(/--RegexCode--/);

hence, regex can be dynamically created. After creation:

"sampleString".replace(/--whatever it should do--/);

Then you can combine them normally, yes.

var finalRe = new RegExp(lower.source + "|" + upper.source);

If regexps are not known beforehand,

var one = /[a-z]/;
var two = /[A-Z]/;

var one_or_two = new RegExp("(" + one.source + ")|(" + two.source + ")")

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