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Textarea is taking lot of time to validate text when pasted from notepad using RegExp in javascript

This is probably because the regexp goes into a loop. Try to find a simpler regexp that terminates faster in case of an error.

Look into *? or validate the text in pieces by first matching part of the regexp (the header). If there is no header -> error.

Then strip the header. Search the rest of the input for the inverse of the allowed characters ([^...allowed chars...]. If you have a match anywhere -> error

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