Dangling meta character '+' 1

[fmaurer]

Hi,

what I am trying to do i to split an expression like 1+2+3 and use + as delimiter. The problem is that I cannot do it neither using

String s = new String("1+2+3");
s.split("+");

nor

Scanner s = new Scanner("1+2+3");
s.useDelimiter("+");

What I've read is that + cannot be used as a regular expression but maybe there is some way to do it?
Regards,
Martin

 

[Diancecht]

I'd try escaping it: "\+" in the regex.

Cheers,
Dian

 

[fmaurer]

Unfortunately I've already tried it
"Invalid escape sequence (valid ones are \b \t \n \f \r \" \' \\ )

 

[stefanwagner]

+ is not a metacharacter in Java-Source, but \ is.
\n, \t have special meanings.

So you mask the plus for regular expressions with a \, but you have then to mask the \ with another one, which will lead to "\\+".

Might produce headaches, when getting more complicated.

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[fmaurer]

It works
Thank you stefan. Seems that I have to read much more about reg. expressions.