regex to match a partial string

Question

i want  a regex to match a string even if there is one character missing in the original string.

For eg. i want  a regex to take  "abcd" as a match and  @bcd,a@bcd,,ab@d,abc@ is found where @ can be any character but there can be only one such deviation at max.

Answer 1

(?x)
(?:
.bcd
|
a.cd
|
ab.d
|
abc.
)

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Regards

Answer 2

thanx for ur reply...

but my problem is that strings are quite long..so i will have to explicitly mention each combination using pipeline...do we have a regex that could make any one and  only one of the character optional.

 

Regards

Answer 3

(?x)
(?:a|(?<g>.))
(?:b|(?<g>(?(g)(?!)|.)))
(?:c|(?<g>(?(g)(?!)|.)))
(?:d|(?<g>(?(g)(?!)|.)))

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Regards