Perl 6 Regex Tablet


Intro - Chapter: 0:History 1:Design 2:Basics 3:Var 4:Op 5:IO 6:Block 7:Sub 8:OOP 9:Rx 10:Meta
Overview - Appendix: A:Index B:Tables C:Cook D:Delta E:Best of F:Links G:Glossary




Larry Wall: We put the "Regular" back into "Expression".

Like quotes, are Regular Expressions now a sublanguage, a language inside the language, instead of being just funny strings. They are parsed by a completely different set of rules, which are stored in the special variable $~Regex ($~Trans for transliterations and $~P5Regex for compatible Regexes). But these rules are made much more consistant with the main language than before.

Literal Character

Every alphanumeric character has no special meaning and stand for the character visible. If a backslash (\) is standing directly in front of the character it becomes a metacharacter. For not alphanumeric chars the opposite is true. Inside of quotes every char is literal.

Metacharacter

table

Modifier

Operators

rx/.../ aka Q :regex /.../
m/.../ aka Q :match /.../
ms/.../ aka Q :match :sigspace /.../.../
s/.../.../ aka Q :subst /.../.../
ss/.../.../ aka Q :subst :samespace /.../.../
tr/.../.../ aka Q :trans /.../.../

Methods

comb
match
subst
trans

Special Variables

$/
$<..>
$()
$0 ..

Matching

Substitution

Transliteration

my $escaped = $html.trans(
[ '&', '<', '>' ] =>
[ '&amp;', '&lt;', '&gt;' ]
);

Grammars

Predefined Rules

Are listed here. <prior> is somehow an exception.

all slang variables


Intro - Chapter: 0:History 1:Design 2:Basics 3:Var 4:Op 5:IO 6:Block 7:Sub 8:OOP 9:Rx 10:Meta
Overview - Appendix: A:Index B:Tables C:Cook D:Delta E:Best of F:Links G:Glossary