Scanning a string for decimal numbers

Ruby
21

Thank you for clearing things, up for me, but could you explain what the
last part of the expression Wilson provided me with means?

it’s (?=[^\d])

2006/2/13, Josef ‘Jupp’ SCHUGT [email protected]:

22

DÅ?a Utorok 14 Február 2006 19:07 Jeppe J. napísal:

Thank you for clearing things, up for me, but could you explain what the
last part of the expression Wilson provided me with means?

it’s (?=[^\d])

That’s a positive zero-width lookahead. I think. Gotta love regexspeak.

In English: look for a single character that’s not a decimal digit, and
don’t
include it in the match.

David V.

23

David V. wrote:

DÅ?a Utorok 14 Február 2006 19:07 Jeppe J. napísal:

Thank you for clearing things, up for me, but could you explain what
the last part of the expression Wilson provided me with means?

it’s (?=[^\d])

These is equivalent (?=\D)

A negative lookahead might work, too: (?!\d)

That’s a positive zero-width lookahead. I think. Gotta love
regexspeak.

In English: look for a single character that’s not a decimal digit,
and don’t include it in the match.

I’d go with this quite simple regexp

/[-+]?\d+(?:,\d+)?/

If numbers like “1,” should be detected, too, then just change the “+”
in
the last group to “*”.

If one wants to prevent to match numbers with leading zeros then it
becomes more complicated but it seems not be worth the effort in this
case.

Kind regards

robert