Re^2: Regex help/ Lua parse

Thank you for your detailed response.

Read and bookmarked perlstyle.

   
$line =~ /^\s*names\s*=\s*{\s*([^}]+)/;
(my $names = $1) =~ y/" //d;
my @tags = split /,/ => $names;
[download]

^ I figured that my original method could be reduced, but I couldn't seem to figure out how to go about it. This is definitely a much more elegant solution. Thank you for your reference to Quote-Like-Operators. I do have a question though about:

(my $names = $1) =~ y/" //d;
[download]

I have seen this construct before on PerlMonks. I did a search and found Use of parentheses around a variable, but wasn't sure how it applied to regexps. Is there a specific name for this method of assignment that I can use to better my search results?

Concepts are easily read, but I feel like I learn most by having my code reviewed by the talented and experienced monks. Thank you again for taking the time out to provide guidance in my learning.

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Re^3: Regex help/ Lua parse by kcott (Archbishop) on Oct 27, 2012 at 04:55 UTC
I don't think that construct has a specific name - it's just using parentheses to change precedence. Usage examples for `s///` can be found in Regexp Quote-Like Operators; examples for `y///` (although its synonym `tr///` is used in these examples) can be found in Quote-Like Operators. In Perl 5.14.0, an `r` option was introduced (see perl5140delta under Core Enhancements - Regular Expressions - Non-destructive substitution). This makes the following equivalences: `# For y/// (my $x = $y) =~ y///; my $x = $y =~ y///r; # Ditto for its synonym tr/// (although not mentioned in perl5140delta +) (my $x = $y) =~ tr///; my $x = $y =~ tr///r; # And for s/// (my $x = $y) =~ s///; my $x = $y =~ s///r;` [download] The first two links above are for the current Perl version (5.16.0 at the time of writing) so they have examples of this also. -- Ken	[reply] [d/l] [select]

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Re^3: Regex help/ Lua parse
by kcott (Archbishop) on Oct 27, 2012 at 04:55 UTC

I don't think that construct has a specific name - it's just using parentheses to change precedence. Usage examples for s/// can be found in Regexp Quote-Like Operators; examples for y/// (although its synonym tr/// is used in these examples) can be found in Quote-Like Operators.

In Perl 5.14.0, an r option was introduced (see perl5140delta under Core Enhancements - Regular Expressions - Non-destructive substitution). This makes the following equivalences:

# For y///
(my $x = $y) =~ y///;
my $x = $y =~ y///r;

# Ditto for its synonym tr/// (although not mentioned in perl5140delta
+)
(my $x = $y) =~ tr///;
my $x = $y =~ tr///r;

# And for s///
(my $x = $y) =~ s///;
my $x = $y =~ s///r;
[download]

The first two links above are for the current Perl version (5.16.0 at the time of writing) so they have examples of this also.

-- Ken

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