| pattern matching | |
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$line =~ /\w+@(\w+\.)+\w+/ and
print "looks like an email address\n";
| . | match any char | [ ] | class of chars |
| ? | zero or one | ( ) | grouping |
| + | one or more | ( | ) | alternatives |
| * | zero or more | \w | alphanumeric char |
| {n,m} | at least n, no more than m | \W | non-alphanumeric |
| modules | |
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| misc | |
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