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!

Possible duplicate of [Java regex for support Unicode?](http://stackoverflow.com/questions/10894122/java-regex-for-support-unicode) — Atri, Nov 28 '15 at 16:23
try to read a couple of answers there, I am pretty sure you will find your answer. — Atri, Nov 28 '15 at 16:29

Slava Vedenin · Accepted Answer · 2016-02-19T09:52:23.627

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 '16 at 09:52

answered Nov 28 '15 at 16:30

Slava Vedenin

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How to validate string using java

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