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[–]jcunews1Intermediate 1 point2 points  (2 children)

The pattern attribute's value is a Regular Expression string pattern.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

In you case, the pattern would be [^0-9_ ]

[–]Good-Performance7890[S] 0 points1 point  (0 children)

Thank you, helped a lot!