1. A method for analyzing a protocol of a network, comprising: obtaining a plurality of conversations from the network, wherein each of the plurality of conversations comprises a sequence of messages exchanged between a server and a client of the network using the protocol, wherein each message of the sequence of messages comprise one or more fields separated by a field delimiter of the protocol; extracting, by a computer processor, a plurality of non-alphanumeric tokens from the plurality of conversations, wherein the plurality of non-alphanumeric tokens comprises a non-alphanumeric token associated with a frequency of occurrence in the plurality of conversations; selecting, based on the frequency of occurrence meeting a pre-determined field delimiter candidate selection criterion, the non-alphanumeric token as a field delimiter candidate; dividing, by the computer processor and using the field delimiter candidate, each of the plurality of conversations into a plurality of slices; analyzing, by the computer processor and using a pre-determined field delimiter candidate scoring algorithm, content included in the plurality of slices to: determine a statistical measure of matched slices for each of the plurality of conversations, wherein the statistical measure of matched slices corresponds to an exact-matched-slices percentage and a prefix-matched-slices percentage that are normalized based on an average number of slices per conversation; determine a field delimiter candidate score by aggregating the statistical measure of matched slices for all of the plurality of conversations; and selecting, by the computer processor and based on the field delimiter candidate score associated with the non-alphanumeric token, the non-alphanumeric token as the field delimiter of the protocol.