Re: Counting characters within regexp

The obscured mails I know are normally shortened resp. normalized, may I suggest that you always use ... three dots?

something like

  DB<98> say "$_:\t", $_ =~ s/(\w\w).*\@.*(\.\w*)/$1...\@...$2/r for q
+w/someone@example.co.uk andrew.test@some.company.co.uk jo@abc.com/

someone@example.co.uk:  so...@....uk
andrew.test@some.company.co.uk: an...@....uk
jo@abc.com:     jo...@....com
[download]

YMMV

edit

FWIW your code is (mostly) OK, but you should really always do it in an if-block to test for a successful match first

if( $em =~ /^(\w[\w|\.]).*@(\w\w).*\.(\w+)$/ ) {
    $em = $1 . '.' x (length($name) - 2) . "\@$2" . '.' x (length($com
+p) - length($3) - 2) . $3;
}
[download]

and you might get bitten by variable interpolation if you don't escape the "@" in a regex: \@

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

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Re^2: Counting characters within regexp by Bod (Parson) on May 09, 2021 at 09:37 UTC
The obscured mails I know are normally shortened resp. normalized, may I suggest that you always use ... three dots? Interesting... That's pretty much what I put into production last evening. This is the live regexp: `$user->{'email'} =~ s/([\w\|\.][\w\|\.])[\w\|\.]+\@(\w\w[\w\|\.])[\w\|\.]+\ +.([\w\|\.]+)/\1...@\2.....\3/;` [download] Although, looking at it again, it could be simplified. Email address don't start with a full stop! you should really always do it in an if-block to test for a successful match first I always do except for simple tests like the one I posted. I have been bitten by that before and spent a couple of long nights trying to work out what was wrong, only to find my regexp wasn't matching an edge case and my loop was using values from the previous iteration. It was years ago but frustrating enough that it is unforgettable! you might get bitten by variable interpolation if you don't escape the "@" in a regex: `\@` Yes - I've been bitten by that before as well. You are quite right, even in a quick test I should have escaped that one. Thanks for the helpful feedback	[reply] [d/l] [select]

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Re^2: Counting characters within regexp
by Bod (Parson) on May 09, 2021 at 09:37 UTC

The obscured mails I know are normally shortened resp. normalized, may I suggest that you always use ... three dots?

Interesting...
That's pretty much what I put into production last evening. This is the live regexp:

$user->{'email'} =~ s/([\w|\.][\w|\.])[\w|\.]+\@(\w\w[\w|\.])[\w|\.]+\
+.([\w|\.]+)/\1...@\2.....\3/;
[download]

you should really always do it in an if-block to test for a successful match first

I always do except for simple tests like the one I posted. I have been bitten by that before and spent a couple of long nights trying to work out what was wrong, only to find my regexp wasn't matching an edge case and my loop was using values from the previous iteration. It was years ago but frustrating enough that it is unforgettable!

you might get bitten by variable interpolation if you don't escape the "@" in a regex: \@

Yes - I've been bitten by that before as well.
You are quite right, even in a quick test I should have escaped that one.

Thanks for the helpful feedback

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