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Regular expressions - how

4 replies on 1 page. Most recent reply: Feb 8, 2006 3:54 AM by Dave Hinton

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assan rekowski

Posts: 22
Nickname: haiaw
Registered: Sep, 2003

Regular expressions - how

Posted: Feb 7, 2006 10:34 AM

Hi,

I have
String variable= "1234X562";

The variable should contain only numbers...

I would like to use regular expression and validate this variable.

Could anybody show me some example code?

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: Regular expressions - how

Posted: Feb 7, 2006 10:23 PM

Reead the API of

String.split(...)

Since you don't give any information where the String is stored or where the splitted Strings should go, I can't give you more information than that.

assan rekowski

Posts: 22
Nickname: haiaw
Registered: Sep, 2003

Re: Regular expressions - how

Posted: Feb 8, 2006 2:12 AM

String stringTest="555";
Pattern p = Pattern.compile("^[0-9]");
Matcher m=p.matcher(stringTest);
while(m.find()){

throw new RuntimeException("FOUND BAD THING");
}

I want to throw exception if stringTest has not only numbers, but this code always throws RuntimeException("FOUND BAD THING");

assan rekowski

Posts: 22
Nickname: haiaw
Registered: Sep, 2003

Re: Regular expressions - how

Posted: Feb 8, 2006 2:49 AM

thanks, i found the solution
But what is the difference between [^0-9] and ^[0-9] ?

Dave Hinton

Posts: 42
Nickname: catbells
Registered: Oct, 2003

Re: Regular expressions - how

Posted: Feb 8, 2006 3:54 AM

[^0-9] matches any character that is not a digit.

^[0-9] matches a digit, but only if it is at the start of the string.

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