Correct regex expression for including whitespace within a match only-CodePudding

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Correct regex expression for including whitespace within a match only

Time：10-21

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.

CodePudding user response：

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.