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wb.c		#1 Posted : 06 December 2023 07:30:03(UTC)
Rank: Advanced Member Groups: Registered Joined: 02/04/2018(UTC) Posts: 135 Was thanked: 22 time(s) in 19 post(s)		What would be the best way to validate an input string in order to ensure it is a number and does not include any other characters? Keep in mind that I'm referring to actual input in string form that is then converted into a number via str2num(). Edited by user 09 December 2023 05:18:59(UTC)  | Reason: Not specified
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Razonar		#2 Posted : 06 December 2023 18:56:39(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,368 Was thanked: 827 time(s) in 524 post(s)		Hi. This could be a way for positive numbers. check.sm (5kb) downloaded 1 time(s). Best regards. Alvaro. Edited by user 07 December 2023 03:52:35(UTC)  | Reason: Not specified
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Davide Carpi		#3 Posted : 07 December 2023 00:12:00(UTC)
Rank: Advanced Member Groups: Registered, Advanced Member Joined: 13/01/2012(UTC) Posts: 2,654 Location: Italy Was thanked: 1340 time(s) in 879 post(s)		Here is a less compact solution, can be adapted to accept different characters. (Positive/negative values can be allowed with an additional condition on the first character) test_input.sm (13kb) downloaded 5 time(s). Edited by user 07 December 2023 02:40:27(UTC)  | Reason: Not specified
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2 users thanked Davide Carpi for this useful post.		on 07/12/2023(UTC),  on 08/12/2023(UTC)
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Razonar		#4 Posted : 07 December 2023 03:54:14(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,368 Was thanked: 827 time(s) in 524 post(s)		Signed numbers allowed. Also, compared with str2num results. check.sm (13kb) downloaded 4 time(s). Best regards. Alvaro.
2 users thanked Razonar for this useful post.		on 07/12/2023(UTC),  on 08/12/2023(UTC)
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overlord		#5 Posted : 07 December 2023 09:16:07(UTC)
Rank: Advanced Member Groups: Registered Joined: 23/07/2013(UTC) Posts: 1,129 Was thanked: 510 time(s) in 340 post(s)		Near identical to Davide, this is how I would do it. At least this is what I have done in QBasic long ago. Regards IsNumber.sm (8kb) downloaded 4 time(s).
4 users thanked overlord for this useful post.		on 07/12/2023(UTC),  on 07/12/2023(UTC),  on 08/12/2023(UTC),  on 08/12/2023(UTC)
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wb.c		#6 Posted : 08 December 2023 11:52:28(UTC)
Rank: Advanced Member Groups: Registered Joined: 02/04/2018(UTC) Posts: 135 Was thanked: 22 time(s) in 19 post(s)		Thanks guys for the input. All very insightful and useful!
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Razonar		#7 Posted : 09 December 2023 09:55:37(UTC)
Rank: Advanced Member Groups: Registered Joined: 28/08/2014(UTC) Posts: 1,368 Was thanked: 827 time(s) in 524 post(s)		Hi. Parenthesis added. Notice that the plus/minus sign must to be only at the first's places, but with parenthesis it is not more true. And it looks like SMath's str2num have a bug: str2num(" ((1)" ) is wrong. Check.sm (22kb) downloaded 3 time(s). Best regards.
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