Recognize \ as string

[tsoct]

How can I include \ as part of the string? 

var A = '/^' + iprefix + '\[0-9A-Z]{' + inumb + '}$/';

From the logs, A was returned as '/^AT[0-9A-Z]{18}$/' where '\' is missing.

[CezaryBasta · Accepted solution]

Use double \\. In this way you will mark \ as escaped character.

See chapter 1.1 here for more explanations.

[Sandeep Rajput]

@tsoct Please update the var A as follows.

var A = '/^' + iprefix + '\\[0-9A-Z]{' + inumb + '}$/';