Do not write a number in the first sentence

MIT App Inventor Help
1

g
The first field of the email must be a letter, not a number
how can ı do that

2

Use the Taifun Textbox extension, and the textboxChanged event Listener
If length of text = 1 then test if is a number, if it is a number then remove it. if not, do nothing.

Or, use a regex test on the text.

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