I would like to read a content String
from file lne by line, and in each line remove all caharcters that are not one of the following [ { } ]
I wanted to used a method:
line = line.replaceAll("[^[({})]]","");
but the problem is that char [
and ]
means in regex syntax something else. How to deal with it?
Best regards
In Java, the regex character classes can have unions and intersections, thus, [
and ]
must be escaped inside if you want them to be treated as literal symbols. And since \\
can be used to define escape sequences, it should be doubled to denote a literal regex-escaping \\
.
Use
line = line.replaceAll("[^\\[({})\\]]","");
^^ ^^
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