1. A method, comprising: identifying, by at least one computing device, a series of characters within a text block, the series of characters being a subset of the text block; binding, by the at least one computing device, the series of characters to generate a text unit; encoding, by the at least one computing device, the text block to generate an encoded text block, wherein the encoded text block comprises a first signal indicating that an entirety of the series of characters in the text unit is to be selected in response to a subset of the series of characters being selected; selecting, by the at least one computing device, in response to the first signal and at least a portion of the subset of the series of characters being selected, the entirety of the series of characters in the text unit; and encoding, by the at least one computing device, in response to an instruction to treat the series of characters as being unbound, the text block to generate a modified encoded text block, wherein the modified encoded text block comprises a second signal indicating that a portion of the series of characters is to be selected in response to the portion of the series of characters being selected.