Java regex for replaceAll

Question

What is the regex expression for replace all the A char with A1, B->B1, C->C1, D->D1 and E->E1 string?

//AND(A<>B,C>D)?GREEN(E-E)

String expr ="AND(A<>B,C>D)?GREEN(E-E)";
String regex="";
expr.replaceAll(regex, "N1");
System.out.println(expr);

The result may be:

AND(A1<>B1,C1>D1)?GREEN(E1-E1)

Thank you

_ has no special meaning in regex, maybe you are confusing it with SQL's replace syntax? — Salem
– Salem, Commented Jul 4, 2017 at 15:04
@1blustone maybe he wrote anything because he says he does not what to write ^^ — azro
– azro, Commented Jul 4, 2017 at 15:05
@michele, after your edit the question is clear, have just provided an answer — Federico Piazza
– Federico Piazza, Commented Jul 4, 2017 at 15:14

Federico Piazza · Accepted Answer · 2017-07-04 15:22:24Z

1

You can use a regex like this:

\b([A-E])\b

With the replacement string $11

Bear in mind that in java you have to escape backslasher, so you have to use:

String expr = "AND(A<>B,C>D)?GREEN(E-E)";
expr = expr.replaceAll("\\b([A-E])\\b", "$11");
System.out.println(expr);

Update: following your comment, if you want to extend the regex to all letters, then replace [A-E] to [A-Z].

answered Jul 4, 2017 at 15:04

Federico Piazza

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2 Comments

it s not working with this expression AND(J<>Q,N-(N*10/100)>O) ...why?

@michele because you said A, B, C, D and E. If you want to replace all letters, then change A-E to A-Z