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I want to write a regular expression where if user enter any special character except spaces between alphabets and numbers in input field should not be allowed to submit their response in R programming.

Any help would be appreciated :)

Nikhil
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    Looks like you are looking to create a regex, but do not know where to get started. Please check [Reference - What does this regex mean](https://stackoverflow.com/questions/22937618) resource, it has plenty of hints. Also, refer to [Learning Regular Expressions](https://stackoverflow.com/questions/4736) post for some basic regex info. Once you get some expression ready and still have issues with the solution, please edit the question with the latest details and we'll be glad to help you fix the problem. – Wiktor Stribiżew Jun 18 '20 at 09:25
  • @WiktorStribiżew Thanks for prompt reply :) will go through the articles shared by you. – Nikhil Jun 18 '20 at 09:31

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