Re: Combining 2 preg matches.

Rik wrote:
Yes and no. It does exactly what you say, but it is simply not valid:

With the pattern:
'/^(?:[a-z0-9]|[a-z0-9][_\-][a-z0-9])+$/';
one states the entire string can be build by either [a-z0-9](1)OR
[a-z0-9][_\-][a-z0-9](2), think of them as blocks.

Let's examine it (not entirely how it works, but this instance close
enough):
(fixed width font is handy now:)
positions: 123456789012345678901234567890
string: really_a_made_up_string
match1: 111111_error, let's try the other option.
match2: 111112--_error, no other matches possible.

There is no possibility for a match with either (1) or (2) at the second _,
and no other options to match instead at the beginning of the string.

Ah! I missed the single letter case.

.

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