javascript create case insensitive regex from string

Question

I am trying to do validations by matching inputs to regexes in a case insensitive way. The regex comes down from service as a string on an object. I might get something like:

{regex:"ane"}

I can do the following:

var rx = new RegExp(object.regex);  /*The regex is now: /ane/*/
"plane".match(rx);

However, I what I really want to do is the following:

var rxInsensitive = new RegExp(/ane/i);  /*The regex is now: /ane/i */
"plANE".match(rx);

I am having problems converting the string to this form however. When I do the following:

var rxInsensitive = newRegExp(object.regex + "/i");

I end up getting the regex /ane/i/ instead of /ane/i. Does anyone have any suggestions?

epascarello · Accepted Answer · 2013-12-12 01:39:54Z

15

var re = new RegExp("pattern", "flags");

so it would be

var rx = new RegExp(object.regex,"i");

See MDN for more info

answered Dec 12, 2013 at 1:39

epascarello

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2 Comments

Conqueror Over a year ago

Wow, just what I needed, thank you for the quick response. I will accept when it becomes available.

M. Atif Riaz Over a year ago

I wonder how can we do the same using regex literal notation instead of constructor notation e.g. matching or 2 label with case in-sensitiveness (label1|label2) ?

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