6. The method of claim 2 , wherein outputting the at least one separator character at a second location proximal to the character string further comprises prepending the at least one separator character to the character string.
2. The method of claim 1 , wherein the at least one separator character comprises a first separator character, wherein the location is a first location, wherein the format source is a first format source included in a plurality of format sources, the method further comprising: receiving, at the computing device, an indication of a second gesture to select a second sequence of keys that are each included in the group of keys of the graphical keyboard; determining, by the computing device, that the second selected sequence of keys corresponds to a second character string that is identified using a second format source of the plurality of format sources; determining, by the computing device and based at least in part on the syntax, that a second separator character is associated with the second character string; and in response to determining that the second separator character is associated with the second character string, outputting, by the computing device and for display at the presence-sensitive display, the second character string and the second separator character at a second location proximal to the second character string.