How to validate string using java

Question

I looked for a solution online, but I didn't find any.

I want to validate input string and check if it contains only ALLOWED characters.

My problem is, that I have "special" alphabet which contains "ěščřžýáí".

For normal English alphabet I can use regex like this A-Za-z.

But what to use for quick check in my language?

My language contains following chars:

String ALLOWED_CHARS = "AÁBCČDĎEÉĚFGHChIÍJKLMNŇOÓPQRŘSŠTŤUÚŮVWXYÝZŽaábcčdďeéěfghchiíjklmnňoópqrřsštťuúůvwxyýzž";

Thank you for your advice!

try to read a couple of answers there, I am pretty sure you will find your answer. — Atri
– Atri, Commented Nov 28, 2015 at 16:29

Slava Vedenin · Accepted Answer · 2016-02-19 09:52:23Z

3

You should use string.matches("[" + ALLOWED_CHARS +"]*") to this check, for example:

String ALLOWED_CHARS = "AÁBCČDĎEÉĚFGHChIÍJKLMNŇOÓPQRŘSŠTŤUÚŮVWXYÝZŽaábcčdďeéěfghchiíjklmnňoópqrřsštťuúůvwxyýzž";
String s1 = "ĎE88É"; 
boolean flag1 = s1.matches("[" + ALLOWED_CHARS +"]*"); // false
String s2 = "ĎEÉ";
boolean flag2 = s2.matches("[" + ALLOWED_CHARS +"]*"); // true

edited Feb 19, 2016 at 9:52

answered Nov 28, 2015 at 16:30

Slava Vedenin

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