Question on regex Matcher (group number)

HI, everybody
I am writing a program on replacement like the one below.
String regex = "(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)(.)";
String original = "ABCDEFGHIJKL";
String replacement = "$12";
Pattern p = Pattern.compile(regex);
Matcher m = p.matcher(original);
String result = m.replaceFirst(replacement);What I actually want is to take out the first group, in this case an "A", and append a character "2" after it.
The result I am expecting is "A2". But the result I get is "L". For the regex engine takes it as the 12th group.
What should I do to remove the ambiguity.
Thanks.

In such case, use $1\\2.

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Question on regex Matcher (group number)

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