Regular expression with re.sub does not behave like expected

Asked Oct 12 '19 at 13:08

Active Oct 12 '19 at 13:15

Viewed 23 times

I'm using re.sub to match and replace everything that is not a number (positive or negative). So for instance: i want "-1" to stay "-1" but

I have tried with:

re.sub('^(-?\d)', "", "-1") 
re.sub('^(-?\d)', "", "1")

But it behave the opposite way, not taking into account the ^ negation

edited Oct 12 '19 at 13:10

asked Oct 12 '19 at 13:08

OTmn

`^` works as negation only inside brackets, as it is it means must start – Dani Mesejo Oct 12 '19 at 13:10
1

woops. My bad forgot the braquet. Thanks @DanielMesejo – OTmn Oct 12 '19 at 13:11
`re.sub('[^-\d]+', "", "-1")` – Toto Oct 12 '19 at 13:15

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