Match only if not preceded or followed by a digit

Question

I have this regular expression to look for phone numbers in a codebase:

\\d{3}[\.\s-]?\d{3}[\.\s-]?\d{4}\g

How can I modify this so that it will not match instances where the number is preceded or followed by a digit?

18005555555 (should not match)
80055555551 (should not match)
"8005555555" (should match)
s800-555-5555 (should match)
8005555555 (should match)
800.555.5555 (should match)

Edit: I'm not trying to "match the whole word", because it is not sufficient that the match is preceded by and followed by a space. See the 3rd example of above that should also return a match.

I want to match only instances where the match is not preceded or followed by a digit.

In others words:

[NOT DIGIT][PHONE NUMBER][NOT DIGIT]

Enclose with `^` and `$`? [`/^\d{3}[.\s-]?\d{3}[.\s-]?\d{4}$/`](https://regex101.com/r/oI4dT9/3) — Wiktor Stribiżew, Mar 07 '16 at 23:31
@WiktorStribiżew that solution would not match "s8005555555" when it should. — Himmel, Mar 07 '16 at 23:39
@SebastianProske, I want to also match those instances where a letter or another character may come before or after the numbers. — Himmel, Mar 07 '16 at 23:40
@Himmel - so using lookahead and lookbehind should work, try `(? — Sebastian Proske, Mar 07 '16 at 23:42
If it is JS flavor: [`/(^|\D)(\d{3}[.\s-]?\d{3}[.\s-]?\d{4})(?!\d)/`](https://regex101.com/r/oI4dT9/5). — Wiktor Stribiżew, Mar 08 '16 at 00:24

score 3 · Accepted Answer · answered Mar 07 '16 at 23:49

Lookahead and lookbehind will help you with these restrictions - if they are supported, like

/(?<!\d)\d{3}[.\s-]?\d{3}[.\s-]?\d{4}(?!\d)/g

You can replace the lookbehind (?<!\d) with (?:^|\D) if it is not supported. You can replace the lookahead (?!\d) with (?:\D|$) if it is not supported.

You can find a demo here: https://regex101.com/r/aS8jQ8/1

Match only if not preceded or followed by a digit

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