This return value is either the empty string (e.g. if the parameter index is {@link #NO_ARG} or the parameter is an empty value) or thestring value found of the associated parameter index.
@param attributes the Attributes that this error might be associatedwith. This is ignored by this class. Sub classes may require this information. @param message the message to test for a match @return null if no match was found. An empty string if the messagematched and the {@link #paramIndex} is {@link #NO_ARG}. If a match occurs where the parameter is defined, the value obtained using {@link RE#getParen}(1) will be returned
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