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http://issues.apache.org/bugzilla/show_bug.cgi?id=41738

           Summary: URLRewritingModifier isn't properly escaping bad regex
                    characters
           Product: JMeter
           Version: 2.2
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTTP
        AssignedTo: [email protected]
        ReportedBy: [EMAIL PROTECTED]


Parameters with brackets: [ and ] are not being escaped properly before the
regular expression is being build.  We have parameters that are being posted
that have these characters: (example: member[33])  This causes pattern match to
fail because the matching is evaluating the brackets as part of the regular
expression.

I was able to fix the problem by adding the necessary escaping.  I modified the
regex init so that the argument name gets escaped properly before 
initialization:
  String argName = escapeParameterName(getArgumentName()); 
  initRegex(argName);

and added the escape function:
  private String escapeParameterName(String value) {
    value = value.replaceAll("\\[", "\\\\[");
    value = value.replaceAll("\\]", "\\\\]");
    return value;
  }

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