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javaregexstringreplaceall

Java String ReplaceAll method giving illegal repetition error?

I have a string and when I try to run the replaceAll method, I am getting this strange error: 

String str = "something { } , op";
str = str.replaceAll("o", "\n"); // it works fine
str = str.replaceAll("{", "\n"); // does not work

and i get a strange error: 

Exception in thread "main" java.util.regex.PatternSyntaxException:
Illegal repetition {

How can I replace the occurrences of "{" ?

Solution

  • A { is a regex meta-character used for range repetitions as {min,max}. To match a literal { you need to escape it by preceding it with a \\:

    str = str.replaceAll("\\{", "\n"); // does work