R – Features common to all regex flavors

language-agnosticregex

I've seen a lot of commonality in regex capabilities of different regex-enabled tools/languages (e.g. perl, sed, java, vim, etc), but I've also many differences.

Is there a standard subset of regex capabilities that all regex-enabled tools/languages will support? How do regex capabilities vary between tools/languages?

Best Answer

Compare Regular Expression Flavors

http://www.regular-expressions.info/refflavors.html

Related Solutions

Regex – How to match all occurrences of a regex

Using scan should do the trick:

string.scan(/regex/)

Regex – How to validate phone numbers using regex

Better option... just strip all non-digit characters on input (except 'x' and leading '+' signs), taking care because of the British tendency to write numbers in the non-standard form +44 (0) ... when asked to use the international prefix (in that specific case, you should discard the (0) entirely).

Then, you end up with values like:

 12345678901
 12345678901x1234
 345678901x1234
 12344678901
 12345678901
 12345678901
 12345678901
 +4112345678
 +441234567890

Then when you display, reformat to your hearts content. e.g.

  1 (234) 567-8901
  1 (234) 567-8901 x1234

Best Answer

Related Solutions

Regex – How to match all occurrences of a regex

Regex – How to validate phone numbers using regex

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