java.util.regex.PatternSyntaxException: Unclosed character class

Exception in thread "main" java.util.regex.PatternSyntaxException:
Unclosed character class near index 1 $[ ^ at java.util.regex.Pattern.error (Pattern.java:1503) at
java.util.regex.Pattern.clazz(Pattern.java:2016) at java.util.regex.Pattern.sequence(Pattern.java:1560)
at java.util.regex.Pattern.expr(Pattern.java:1520) at java.util.regex.Pattern.compile (Pattern.java:1288)
at java.util.regex.Pattern.&lt;init&gt;(Pattern.java:1044)  encountered while splitting the string
using a delimiter which contains "["

January 24, 2010 | Filed Under Java

Comments

One Response to “java.util.regex.PatternSyntaxException: Unclosed character class”

Expert on January 24th, 2010 1:13 pm

This error can be encountered while splitting a string or using string.replaceAll(”string which contains a special character”,”x”)
Following are the special characters in java regular expressions. If you have any one of them in your input string, then you will face this exception.
Use the common methodology of backslash to escape such characters.

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