4 ms·

Be aware though that \d will also find arabic or roman numerals. :)

• mhaymo 12y ago
  Roman numerals? I have never encountered a regex implementation where '\d' matches 'X'. It's certainly not the case for Javascript: http://regexpal.com/?flags=g&regex=\d%2B&input=10%0Ax%0AX%0AVII%0AMMXIV http://regexpal.com/?flags=g&regex=\d%2B&input=10%0Ax%0AX%0A...
  • mmastrac 12y ago
    There's a whole lot of these numeral characters in unicode, for example: http://www.charbase.com/2169-unicode-roman-numeral-ten http://www.charbase.com/2169-unicode-roman-numeral-ten (even more in http://www.charbase.com/block/number-forms http://www.charbase.com/block/number-forms) I'm not sure if Javascript matches these in its \d pattern, however, but I think that most regexp engines default to the ascii [0-9] unless you are using \p{Number}.
    • fennecfoxen 12y ago
      > /\d/.test("\u2169") false
    • pyre 12y ago
      There's also the character classes in Unicode: http://www.fileformat.info/info/unicode/category/index.htm http://www.fileformat.info/info/unicode/category/index.htm
  • jaredmcateer 12y ago
    Ruby also does not match roman numerals with \d http://rubular.com/r/bOCmLIfKdZ http://rubular.com/r/bOCmLIfKdZ
• UweSchmidt 12y ago
  \d finds arabic numerals? As in 0-9? Scandalous :) http://en.wikipedia.org/wiki/Arabic_numerals http://en.wikipedia.org/wiki/Arabic_numerals
  • extra88 12y ago
    Perhaps they mean Eastern Arabic numerals. http://en.wikipedia.org/wiki/Eastern_Arabic_numerals http://en.wikipedia.org/wiki/Eastern_Arabic_numerals
    • acdha 12y ago
      Indeed - those are in use by millions of people. I wonder if any regexp implementation has started matching all of the other number symbols in Unicode: http://en.wikipedia.org/wiki/Numerals_in_Unicode http://en.wikipedia.org/wiki/Numerals_in_Unicode
      • greglindahl 12y ago
        Perl does, by default. There's a modifier if you want to only match ASCII digits.