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RegexUtils zef:grizzlysmit last updated on 2023-02-04

RegexUtils

1. CreatePerlRegex
2. CreateEMCA262Regex
3. get-modern-perl5-flags
4. get-old-perl5-flags
5. get-modern-emca262-flags
6. get-old-emca262-flags

method CreatePerlRegex(Str:D $rg, Str:D $flags is copy = '')

CreatePerlRegex constructs a Perl5 regex from a string with the required flags.

Note: not all raku flags are supported due to diffrences between the flags in the two languages

[0] > use RegexUtils;
Nil
[1] > my $regex-perl5 = RegexUtils.CreatePerlRegex('^fo+\n$', ':ignorecase');
rx:Perl5:ignorecase/^fo+\n$/
[2] > so 'Fooo' ~~ $regex-perl5;
False
[3] > so "Fooo\n" ~~ $regex-perl5;
True
[4] > say $regex-perl5;
rx:Perl5:ignorecase/^fo+\n$/

method CreateEMCA262Regex(Str:D $str, Str:D $flags is copy = '' --> Regex:D)

CreateEMCA262Regex converts a EMCA262 Regex to a raku one. using the EMCA262Regex package and applies flags to it.

[0] > use RegexUtils;
Nil
[1] > my $regex-emca = RegexUtils.CreateEMCA262Regex('^[f][o]+\n', ':ignorecase');
rx:ignorecase/^<[f]><[o]>+\n/
[2] > so "Fooo\n" ~~ $regex-emca;
True
[3] > so " Fooo\n" ~~ $regex-emca;
False

Note: ignorecase only works for cases like below due to how EMCA262Regex translates the charater constants, this is a problem that needs solving.

e.g.

raku [0] > use RegexUtils; Nil [1] > my $regex-emca = RegexUtils.CreateEMCA262Regex('^fo+\n', ':ignorecase'); rx:ignorecase/^\x66\x6F+\n/ [2] > so "Fooo\n" ~~ $regex-emca; False

method get-modern-perl5-flags(Str:D $flags --> Str:D)

method get-old-perl5-flags(Str:D $flags --> Str:D)

method get-modern-emca262-flags(Str:D $flags --> Str:D)

method get-old-emca262-flags(Str:D $flags --> Str:D)