Comment on YX ProblemparentComments−a13692099932yIt's something like '([^a]|a[^b]|a$)*'.And, proving that any curt correction of a silly error will likely contain its own silly error, I think that should actually be '^([^a]|a[^b]|a$)*$', since grep defaults to searching rather than matching.
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And, proving that any curt correction of a silly error will likely contain its own silly error, I think that should actually be '^([^a]|a[^b]|a$)*$', since grep defaults to searching rather than matching.