Correct regex expression for including whitespace within a match only

Question

I have this sample of string Lorem ipsum +12 121 323 454 dolor sit amet. Here is my RegEx ([0-9+?\s]) but it includes outside spaces.

Use a look around: (?<=^|\s)([\d+?\s]+)(?=\s|$).

Poul Bak
– Poul Bak

2022-10-21 04:34:47 +00:00
Commented Oct 21, 2022 at 4:34 — Poul Bak
– Poul Bak, Commented Oct 21, 2022 at 4:34

Amadan · Accepted Answer · 2022-10-21 04:29:22Z

3

Start with a nonspace and end with nonspace:

[0-9+](?:([0-9+?\s]*[0-9+]))?

A digit or a plus, followed optionally by any number of digits, plusses or spaces, finally ending in a digit or a plus.

answered Oct 21, 2022 at 4:29

Amadan

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The fourth bird · Accepted Answer · 2022-10-21 08:16:05Z

1

You are just matching a single character with ([0-9+?\s]) that also matches a whitespace char with \s, that is why you are also matching "single" spaces.

You can use whitespace boundaries to the left and right, than match an optional plus sign at the start followed by 1 or more digits and then optionally repeat 1 or more whitespace characters followed by again 1 or more digits.

(?<!\S)\+?\d+(?:\s+\d+)*(?!\S)

Regex demo

answered Oct 21, 2022 at 8:16

The fourth bird

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