I'm pretty sure this hasn't actually been answered yet on this site. For once and for all, what is the smallest regex that matches a numeric string that is in the range of a 32-bit signed integer, in the range -2147483648 to 2147483647.
I must use regex for validation - that is the only option available to me.
I have tried
\d{1,10}
but I can't figure out how to restrict it to the valid number range.
To aid developing in regex, it should match:
-2147483648
-2099999999
-999999999
-1
0
1
999999999
2099999999
2147483647
It should not match:
-2147483649
-2200000000
-11111111111
2147483648
2200000000
11111111111
I have set up an on-line live demo (on rubular) that has my attempt and the test cases above.
Note: The shortest regex that works will be accepted. Efficiency of regex will not be considered (unless there's a tie for shortest length).