Perl 6 Deep Dive

\d and \D characters

The \d character class matches with a digit. A digit here is understood as a Unicode character from the Number category. Among the traditional Arabic numerals 0-9, there are digits from other alphabets and scripts. The whole list of these characters is exhausting but let us give a few examples of other digits:

• Arabic-Indic: ٠ ١ ٢ ٣ ٤ ٥ ٦ 
• Nko (from the right-to-left alphabets of West Africa):  
• Devanagari (India and Nepal): ० १ २ ३ ४
• Bengali: ০ ১ ২ ৩ ৪
• Mathematical bold: 𝟎 𝟏 𝟐 𝟑 𝟒
• Mathematical double-struck: 𝟘 𝟙 𝟚 𝟛 𝟜

Any of these digits will match against \d:

$ perl6 -e'say "OK" if "" ~~ /\d/'OK