I am trying to write an expression that allows only letters and numbers. Why this expression is false:
Regex.IsMatch("1298red673419dfRED2", "[a-zA-Z0-9]+/g")
I am using VB.NET in VS2019
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1`Regex.IsMatch("1298red673419dfRED2", "^[a-zA-Z0-9]+$")` – Wiktor Stribiżew Feb 23 '21 at 01:35
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Wiktor, thank you for the answer. It is working. Do you know why the behavior is the same if I use * instead of + as you put in your answer? – Florin Feb 23 '21 at 20:22
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1It is not the same, try with `"a"` and `""` as input. – Wiktor Stribiżew Feb 23 '21 at 20:26
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1@WiktorStribiżew I understand now: one accepts empty strings, and the other one doesn't. Thank you for your help. – Florin Feb 24 '21 at 16:16