Question

I came across an interesting question on java regex
Is there a regular expression way to replace a set of characters with another set (like shell tr command)?
So I tried the following:

                String a = "abc";
                a = a.replaceAll("[a-z]", "[A-Z]");

Now if I get print a the output is

                [A-Z][A-Z][A-Z]

Here I think the compiler is taking the first argument as gegex, but not the second argument.

So is there any problem with this code or something else is the reason???

Answer 1

This is the way replaceAll works.

See API:

public String replaceAll(String regex, String replacement)

Replaces each substring of this string that matches the given regular expression with the given replacement.