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kurila17delta - what is new for Perl Kurila 1.7


This document describes differences between Perl Kurila 1.6 and Perl Kurila 1.7

Highlights In Perl Kurila 1.7 ^

Core Enhancements ^

Block interpolation using {...} inside double quoted strings

Inside double quoted strings {...} are interpolated in double quoted strings. They can also be used to evaluate code inside a replacement part of the substitute, for example s/<<=(.*)/{ eval $1 }/g >.


Makes interpolating code inside a double quoted string easy.

Numeric comparison operators renamed.

The numeric comparison operators < <= > >=, and <=> are renamed to +<, +<=, +>, +>= and <+> respectively.


Makes the old comparison operators free for other uses.

Interpolation independent of the delimiter

Single quotes don't have any special meaning when used as delimiters for other constructors, i.e. m'$a' is the same as m/$a/.


Simplifies the currently complex interpolation rules.

No-escaping within single quotes

Single quotes do not do any escaping. This includes not escaping \\ and \'.


Makes single quotes consistent in not doing escaping.

Substitute modifier s///e is removed

The substitute modifieders s///e and s///ee to evaluate the replacement are no longer supported. The new interpolating {...} can be used instead.


Removed in favor of using {...}

Obligatory m in front of matches.

/PAT/ is longer supported and instead m/PAT/ must be used. Depending on the context a / will be interpreted as a divide operator or an error will be raised.


Simplifies the interpretation of /

Renamed readline <> operator to ~<

The readline operator <FH> has been renamed to ~< *FH. There is no special syntax for ~<. There is no default *ARGV, and *ARGV must be explictly given to ~<


Makes the syntax more consistent

open must have a separate mode and filename

open should always be used with separate mode and filename. Using open with 2-arguments with a concatenate mode and filename no longer works and gives an error.


Makes the distinction between mode and filename explicit.

Removal of $]

The version variable $] has been removed. $^V (eq "kurila-1.7") or $kurila::VERSION (eq "1.7") can be used instead


Removed because it does not indicate the difference between Perl 5 and Kurila.



Documentation has not been updated for many of the changes for kurila.

Limited platform support

Perl Kurila has only been tested/build for x86_64-linux-gnu-thread-multi platform.


The INSTALL file for how to build Perl Kurila.

The README file for general stuff.

The Artistic and Copying files for copyright information.


Written by Gerard Goossen <>.

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