Re^3: Regex help/ Lua parse

[kcott]

in reply to Re^2: Regex help/ Lua parse
in thread Regex help/ Lua parse

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;

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.