Question

I want to match \Q and \E in a Java regex.
I am writing a program which will compute the length of the string, matching to the pattern (this program assumes that there is no any quantifier in regex except {some number}, that’s why the length of the string is uniquely defined) and I want at first delete all expressions like \Qsome text\E.
But regex like this:

"\\Q\\Q\\E\\Q\\E\\E"

obviously doesn’t work.

Answer 1

Use Pattern.quote(...):

String s = "\\Q\\Q\\E\\Q\\E\\E";
String escaped = Pattern.quote(s);