How come plus, minus, muliple and division regex operators also match decimal?

Question

I tried regex 'minus', 'plus', 'multiplication' and 'division', /[*+-/]/. This regex matches all the operator signs, but it also matches decimal point. How come? How to match only these operators but not decimal?

I did it on https://www.regexpal.com/

Use ths: [*+/-] instead ( the minus '-' must be last, or it matches a range of characters) — Poul Bak, Dec 16 '18 at 19:47

score -1 · Answer 1 · answered Dec 16 '18 at 19:50

Inside square brackets, the construction a-b matches any character sorting between a and b. The regular expression [*+-/] matches any one of the following:

* as asterisk, U+002A.
Any character sorting between + (U+002B) and /, namely + (plus sign, U+2B), , (comma, U+002C), - (hyphen-minus, U+002D), . (period, U+002E) and / (solidus, U+002F).

How come plus, minus, muliple and division regex operators also match decimal?

1 Answers1