So, first off, this is for a homework assignment. The problem involves taking an arbitrarily long list of REGEX strings and searching for them in a file. Would it be better, or faster, to search each line in the file, one string at a time or with alternation...(str1|str2).

my $rexs = '(' . join('|', @regexs) . ')';
#...
if(/$rexs/)
{...}

#or..
foreach $rex (@regexs)
{
    if(/$rex/)
    {...}
}

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In reply to Alternation vs. looping for multiple searches. by kprice++

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