Intl::Token::Number

A regex token for detecting localized numbers

To use, simply include the token <local-number> in anything interpreted as regex.

use Intl::Token::Number;

# (assuming English)
if '15,859,333.41' ~~ /<local-number>/ {
    say ~$<local-number>;  # 15,859,333.41   <-- stringified
    say +$<local-number>;  # 15859333.41     <-- numerical
}

The <local-number> token defaults to using the language provided by user-language. This makes it quite useful for parsing CLI. Sometimes, though, you'll want / need to specify the language directly. Just include it after a colon:

# Korean uses commas to separate thousands
'1,234' ~~ /<local-number: 'ko'>/;
say +$<local-number>; # 1234

# Spanish uses commas to separate integers from fractionals
'1,234' ~~ /<local-number: 'es'>/;
say +$<local-number>; # 1.234

Formats including percents, permilles, and exponential notation are supported:

# Assuming English
'90%' ~~ /<local-number>/;
say +$<local-number>; # 0.9

'1.23E3' ~~ /<local-number>/;
say +$<local-number>; # 123

For those interested in details about the match, the match object is introspectable:

• base-number: the number matched, ignoring percent/exponential modifiers
• exponent: the exponent used (defaults to 1 for non-exponential numbers)
• number-type: any of standard, percent, permille, exponential

To do

• Add support for native/traditional/financial-style numbers
• Add support for lenient parsing (e.g. accept any of <,٫⹁︐﹐，> for ,).
  • This will be very important for languages like Finnish, which uses a non-breaking space, but is probably entered as a plain space by most people.
• Enforce grouping digits? Present, 1,2,3,4 will parse as 1234.
• Additional formats like approximately, at least, etc.

Version history

• v0.6
  • Optimized grammar
  • Now uses RakuAST for generation.
  • Match role provides more introspection
  • Now prefer User::Language to Intl::UserLanguage
• v.0.5.0
  • First published version as an independent module
  • Adapted to work with newest version of Intl::CLDR
  • Housekeeping
    • Cleaned up code, added documentation, improved tests
• v.0.4.2
  • Renamed to Intl::CLDR::Numbers
• v.0.4.1
  • Published as a part of Intl::CLDR (as Intl::CLDR::Numbers::NumberFinder)
  • Support for basic number parsing using default numeric systems