Angular 2 Reactive Forms 'pattern' validator not working

Question

I have defined the following validation:

            Validators.pattern("/^[ABCEGHJKLMNPRSTVXY][0-9][ABCEGHJKLMNPRSTVWXYZ][0-9][ABCEGHJKLMNPRSTVWXYZ][0-9]$/")]]

Its to validate postal codes, but when I enter the string 'K1K1A1' the validator says its invalid.

What is wrong with my regex?

postal codes isn't helpful. Which country postal codes? What is a valid postal code in your case? — AVJT82
– AVJT82, Commented Jun 11, 2017 at 18:34

Serginho · Accepted Answer · 2017-06-11 18:50:09Z

7

Validators.pattern() looks like:

if (typeof pattern === 'string') {
  regexStr = `^${pattern}$`;
  regex = new RegExp(regexStr);
} else {
  regexStr = pattern.toString();
  regex = pattern;
}

So, just remove slashes and ^$ characters to fit with angular. Or you also remove quotes and javascript will take your expression as a RegExp type.

edited Jun 11, 2017 at 18:50

answered Jun 11, 2017 at 18:40

Serginho

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2 Comments

Serginho Over a year ago

Yes, removing quotes the typeof is equals RegExp.

Zhu Over a year ago

can you please help me to solve this stackoverflow.com/questions/52091334/… @Serginho

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