13.3 A User Interface for Creating Regular Expressions 251
such as those introduced later in this chapter. However, previous systems
that infer text-editing programs from examples have extremely poor
visibil-
ity when considered as programming languages: they effectively hide the
completed program from the user. They require that the user work only by
manipulating the data, with the option of rejecting incorrect hypotheses af-
ter observing the results of executing an undesired inferred program. Sev-
eral previous PBE systems have recognized this problem and have provided
visual representations of the inferred program. Early ...
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