What does the regular expression "\d{1,6}" check for?

159

What does the regular expression "\d{1,6}" (used in an ASP.NET MVC route as parameter constraint) check for/allow?

+4 A:

a number with 1-6 digits

Devin Ceartas 2009-09-25 00:54:37

"100,000" is a number with 6 digits.

Bill the Lizard 2009-09-25 00:57:32

So is 1.623e-12 but that's *also* being picky :-)

paxdiablo 2009-09-25 01:00:57

Sorry, I don't mean to be picky, but regular expressions are very picky about what they will match. :)

Bill the Lizard 2009-09-25 01:09:04

No, you *should* be picky. Engineering is, after all, meant to be an exact science. Otherwise I would have majored in English Lit.

paxdiablo 2009-09-25 01:41:07

+16 A:

That will match 1-6 consecutive occurrences of any of the digits 0-9 (not necessarily the same digit).

Bill the Lizard 2009-09-25 00:54:49

acc. even though later because you clarified that it has to be consecutive.

Alex 2009-09-25 01:03:57

+1 for being meticulously accurate.

paxdiablo 2009-09-25 01:06:19

+4 A:

\d is the class for digits the {1,6} means one to six element(s) of that class

if you want some reference you can consult this website probably not the best but kind of nice summary.

RageZ 2009-09-25 00:56:08

+1 A:

\d means a single decimal character. 0~9.

{minimum-length, maximum-length} means a precede expression (\d in this case) will be followed repeatedly.

As a result, your expression \d{1,6} would match any of them.

0 12 874 4757 48727 557473

xrath 2009-09-25 02:33:41

ansaurus