How do I count the number of characters in a long string in TCL?

Question

I tried this, but it doesn't count the spaces. I need to limit the input text to 255 characters.

put text_length [string length $additional_information]

I would like to count the number of entered characters including spaces and enter, and save the number of characters in text_length (with space and enter).

put text_length [string length $additional_information]

Answer 1

Try this.

set additional_information "   abc\n"
set text_length [string length $additional_information]
puts $text_length
if {$text_length > 255} {
    .button configure -state disabled
} else {
    .button configure -state enabled
}

This should output 7 and grey out the button.