An embodiment of the present invention evaluates plural expressions. A model is generated and configured to evaluate a plurality of expressions each including one or more expression tokens and indicating a data pattern. The model includes a plurality of nodes with one or more of the nodes associated with an expression token and one or more links between the nodes. The links are associated with information indicating each expression including each expression token associated with nodes connected by the links. Data including one or more data tokens is applied to the model. The nodes of the model are traversed over one or more corresponding links based on the one or more data tokens within the data corresponding to expression tokens associated with the nodes. Expressions corresponding to the data are determined based on the expressions associated with the one or more corresponding links.