US Patent 8141149 Keyword obfuscation

Embodiments of the invention provide novel systems, methods and software for searching and/or analyzing text, based on a list of one or more keywords of interest. In a set of embodiments, a first computer generates a regular expression satisfied by a particular keyword of interest as well as a hash value corresponding to the keyword. In some embodiments, the regular expression and the hash value are transmitted to a second computer, which identifies a set of text associated with a particular event and/or evaluates the set of text against the regular expression. If the text satisfies the regular expression, the second computer might generate a text hash from the text. This text hash can be compared with the hash from the package, and if there is a match, the event might be identified as requiring monitoring, collection and/or further analysis.