javascript - Regex issue with comma -

To get rid of a certain text field # city , I want to remove that error message

This letter works with numbers and points, but I can not find it to work with a comma.

Code:

  $ ('Input # city'). Blurring (work () {var cityc = $ (this) .val (); if (/ ^ [az 0-9]. '] {2,25} $ / i.test (Cityc)) $ $ (this) .removeClass ('invalid'); $ ('span.cityerror'). RemoveClass ('active');}});  

Therefore, if an error message exists, and if the value of the text contains numbers or numbers of letters, the error message disappears, but if a comma is not it.

I tried to modify the line in such a question:

  if (/ ^ [az 0-9., '] {2,25} $ / i .test (cityc) {{Code>  
 As you can see I have added a comma in the expression, but it will still not get staining if the value of the input is included in a comma?  
 Update:  
 So if I enter  city  for example, the message disappears, but  city,  Or  city, , it is not. 
 

I'm not a regex expert, but

you can try it :

  if (/ ^ ([a-z0-9] + [. ',]] [A-z0- 9] *) + $ / I.test (cityc)) { ...}  

edit

  What about it: if (/ ^ [A-za-J 0- 9. ',] + $ /. Exam (City)) {...}