Re: [External] : Use the characters "+" and "-" in regular expressions

[Jean Louis]

* steve-humphreys@gmx.com <steve-humphreys@gmx.com> [2021-05-20 14:41]:
> >   (string-match "[\s]+ " s)
> >
> > Matches any white-space character.
> 
> That would actually match a sentence, which I don't want.
> 
> What I like to match is a string composed only of whitespace.

Did we not discuss it recently? 

This is how you can make negative match:

(not (string-match "[^[:blank:]]" " ")) ⇒ t

But if there is anything inside that is not blank character, it will
not match:

(not (string-match "[^[:blank:]]" "                j")) ⇒ nil



-- 
Jean

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