On 6/4/02 10:26 PM, "Adam Vardy" <[EMAIL PROTECTED]> wrote:
> Can someone help please. I'm learning from scratch. What is this?
>
> $_='My email address is <[EMAIL PROTECTED]>.';
Sets the magical Perl variable $_ to equal the scalar value:
My email address is <[EMAIL PROTECTED]>
> /(<.*>)/i;
This is what's called a regular expression. Because it's not bound to a
particular variable using the =~ notation, it automatically tries to make a
match with whatever's in the magical $_.
The slashes are the delimiters of the match; you're trying to match what's
inside the slashes. The metacharacter "." matches any character; the
quantifier "*" matches 0 or more of the preceding character -- in this case,
any character. The angle brackets are regular characters. Therefore, the
regular expression is trying to match any characters within angle brackets
-- i.e., your e-mail address.
The parentheses around the regular expression (here, the entire match, but
it could be just a portion of a larger regular expression) capture whatever
is matched for later use; this portion is stored in another special Perl
variable, $1.
> print "Found it ! $1\n";
The print function prints "Found it! ", followed by the pattern that was
captured (<[EMAIL PROTECTED]>), capped off by a newline.
> I can only identify one command here. Print. How does this 'program'
> run?
HTH. And I'm reasonably new at this too, so if I got something wrong,
hopefully someone who knows what they're doing will correct me.
- geoff
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