6. The method of claim 1 wherein the expression includes a plurality of tokens including the must token and property token, and wherein the expression indicates that a first one of the plurality of tokens is ordered before a second one of the plurality of tokens.
1. A method comprising: loading first text data into a text buffer, the first text data comprising a plurality of text characters; presenting the first text data in a graphical user interface; receiving a first user selection of a first set of characters in the first text data selected via the graphical user interface; receiving a first user request to define the selected first set of characters in the first text data as a must token, wherein the first user request includes user selection of a must type from a plurality of token types via the graphical user interface; receiving a second user selection of a second set of characters in the first text data selected via the graphical user interface; receiving a second user request to define the selected second set of characters in the first text data as a property token, wherein the second user request includes user selection of a property from the plurality of token types via the graphical user interface and designation of a property name corresponding to the selected second set of characters; and defining an expression including the defined must token and defined property token, wherein the must type identifies that the first selected set of characters in the first text data must be included within other text data evaluated against the expression and the property type identifies that other text portions corresponding to the second selected set of characters in other text data evaluated against the expression correspond to a value in a property name/value pair.