Bug 122254 Not Like operator is missing in the Filter tab of Data Set window
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/ScriptEvalUtil.java
}
			else if ( c == '%')
			{
				buffer.append(".*");
			}
			else if ( c == '_')
			{
				buffer.append(".");
			}
			else
			{
				
				if ( reservedChars.indexOf(c) >= 0 )
				{
					buffer.append('\\');
				}
				buffer.append(c);
			}
		}
		
		try
		{
			String newPatternStr = buffer.toString();
			Pattern p = Pattern.compile( newPatternStr );
			Matcher m = p.matcher( sourceStr.toString( ) );
			return m.matches( );
		}
		catch ( PatternSyntaxException e )
		{
			throw new DataException( ResourceConstants.MATCH_ERROR,  e, pattern );