Question

Is it possible to combine regular expressions in javascript.

For ex:

 var lower = /[a-z]/;
 var upper = /[A-Z]/;
 var alpha = upper|lower;//Is this possible?

ie. can i assign regular expressions to variables and combine those variables using pattern matching characters as
we do in regular expressions

Answer 1

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);