9. A system for data loss prevention for text fields, wherein: an identification module, stored in memory, that identifies a form submission sent from a client system, the form submission comprising a textual field; a storing module, stored in memory, that: stores at least one characteristic of a value of the textual field within the form submission in connection with an identifier of a form used to generate the form submission; stores an additional characteristic of an additional value of an additional textual field within the form submission in connection with the identifier of the form; a determination module, stored in memory, that: determines, based at least in part on the characteristic of the value of the textual field, that the textual field comprises user-generated content; determines, based at least in part on the additional characteristic, that the additional textual field does not comprise user-generated content; an interception module, stored in memory, that intercepts a subsequent form submission derived from the form; a subjection module, stored in memory, that: subjects the textual field within the subsequent form submission to a data-loss-prevention analysis based at least in part on determining that the textual field comprises user-generated content; omits the additional textual field from the data-loss-prevention analysis based at least in part on determining that the additional textual field does not comprise user-generated content; a performing module, stored in memory, that performs a data-loss-prevention action based on the data-loss-prevention analysis; at least one processor that executes the identification module, the storing module, the determination module, the interception module, the subjection module, and the performing module.
9. A system for data loss prevention for text fields, wherein: an identification module, stored in memory, that identifies a form submission sent from a client system, the form submission comprising a textual field; a storing module, stored in memory, that: stores at least one characteristic of a value of the textual field within the form submission in connection with an identifier of a form used to generate the form submission; stores an additional characteristic of an additional value of an additional textual field within the form submission in connection with the identifier of the form; a determination module, stored in memory, that: determines, based at least in part on the characteristic of the value of the textual field, that the textual field comprises user-generated content; determines, based at least in part on the additional characteristic, that the additional textual field does not comprise user-generated content; an interception module, stored in memory, that intercepts a subsequent form submission derived from the form; a subjection module, stored in memory, that: subjects the textual field within the subsequent form submission to a data-loss-prevention analysis based at least in part on determining that the textual field comprises user-generated content; omits the additional textual field from the data-loss-prevention analysis based at least in part on determining that the additional textual field does not comprise user-generated content; a performing module, stored in memory, that performs a data-loss-prevention action based on the data-loss-prevention analysis; at least one processor that executes the identification module, the storing module, the determination module, the interception module, the subjection module, and the performing module. 10. The system of claim 9 , wherein the determination module determines that the textual field comprises user-generated content based at least in part on a plurality of characteristics of a plurality of values of the textual field collected from a plurality of form submissions.