Regex Class With Exceptions

Question

I know that the regex class \D matches "all characters that are non-numeric" but I would like to match on all characters that are non-numeric and are not / or -

How might I do this? Thanks!

Be it for JavaScript or any other language, ndn's answer is "the best". In Java, you could use [\\D&&[^/-]], in .NET [\D-[/-]]. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Jan 12, 2016 at 21:37

ndnenkov · Accepted Answer · 2016-01-12 17:46:29Z

3

You can negate character sets by putting ^ inside:

[^\d\/-]

Will match any one character, which is not a digit, forward slash or dash.

answered Jan 12, 2016 at 17:46

ndnenkov

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Ryszard Czech · Accepted Answer · 2021-08-07 13:57:01Z

You already know how to find non-numeric characters with \D. You may lay a restriction on the \D to exclude / and - and any other non-numeric characters with a negative lookahead:

(?![\/-])\D

See regex proof.

EXPLANATION

--------------------------------------------------------------------------------
  (?!                      look ahead to see if there is not:
--------------------------------------------------------------------------------
    [\/-]                    any character of: '\/', '-'
--------------------------------------------------------------------------------
  )                        end of look-ahead
--------------------------------------------------------------------------------
  \D                       non-digits (all but 0-9)

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