Assuming valid aliases must match \w+, you can say 

my @aliases = $sql =~ /\bas\s+(\w+)/ig;

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The /i is necessary because SQL is generally case-insensitive. Note that this may return false positives if, eg, your query has a string literal with the word "as" in it, but it's a first approximation. Global (/g) match in list context returns the list of patterns matching the group (\w+). perlretut goes into this also.

Also, I don't know if this is standard or not, but some databases allow the keyword "as" to be omitted, so you can say 

SELECT foo a, bar b FROM baz

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In reply to Re: Simple little regex to build a list by Errto
in thread Simple little regex to build a list by wolis

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