Summary

In order to avoid too long description of an error occurred during compilation of a regexp pattern, only a portion of the pattern may be included in this description.

Problem

PatternSyntaxException.getMessage() returns a multiline detailed description of the error occurred during compilation, including the pattern itself. If the pattern is very long, this description becomes hard to read.

Solution

If the pattern is too long, only a portion of it has to be included in the description. The pattern can be truncated from beginning, from the end, or from both ends. The displayed portion should include the position, where the error occurred.

Specification

After update, the javadoc of the method PatternSyntaxException.getMessage() will read as following:

/**
  * Returns a multi-line string containing the description of the syntax
  * error and its index, the erroneous part of the regular-expression
  * pattern, and a visual indication of the error index within the pattern.
  *
  * @return  The full detail message
  */