Matching mutually exclusive string in regex

[Gaurav Kr. Arora]

Hi,

My input can be only abj or abr. no other combination of any other or these a,b,j,r characters or abjr is also invalid.
Only "abj" or "abr" are valid to me.. this is a part of another string. So ^ or $ cannot be used.

String input = "abj";
Scanner s = new Scanner(input);
String regex = null;
s.findInLine(regex);
MatchResult result = s.match();
System.out.println("Result: "+ result.group());

Could you please help me in creating the regex for this?

I tried different combinations like "ab[rj]{1}" but it didn't help. It matches with abjr also.

[Mike Simmons]

I think you need to look into the differences between findInLine(), find(), and matches().

[Gaurav Kr. Arora]

Mike Simmons wrote:I think you need to look into the differences between findInLine(), find(), and matches().

Scanner doesn't has find and matches method and I have to use Scanner and findInline method (as it is already present in my framework)
Please help in creating regex.

[Mike Simmons]

Wait... because something is present in your framework, you have to use it? Really? How sad.

I suppose you could put something in the regex to require a line break of some sort after the [rj]. I suggest looking through the java.util.regex.Pattern documentation to find ways to represent this - I believe there are several possibilities.

[Darryl Burke]

abjr is also invalid.
Only "abj" or "abr" are valid

If that's the complete spec then

ab((j(?!r))|r)

What about "abrj" ? "abrr" ?