Re: regex matching exactly 10 digits

Paul Lalli wrote:
#append 1 to 10 digit fax number
$fax_num =~ s/(\d{10,10})/1$1/;


You are missing the fact that a regexp doesn't care what *else* is in
the string. You are checking only to see if the string *contains* the
pattern. "At most" does not mean that the string cannot contain more
of that token. It means that this particular piece of the regexp will
not match more than that many. You need to explicitly check that
another digit neither precedes nor follows the ten that you've found:

Depending on the OP's data, the simpler
match

/^\d{10,10}$/

may serve.

BugBear
.

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