1. A computer-implemented method, comprising: selecting a regular expression from a set of regular expressions used to identify a text portion of a message; retrieving a set of one or more configuration parameters arranged to limit expansion of features of the regular expression into a set of potential regular expression key terms, at least one configuration parameter operative to determine which feature to expand and which feature not to expand; identifying a set of one or more features within the regular expression enabled by the set of configuration parameters; and generating a set of one or more identified regular expression key terms from the enabled features of the regular expression.