Google spreadsheets in-cell string length validation -

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i have column want write down numbers, numbers long, 25 characters, , miss type @ least knowing have typed correct amount of characters helpful.

when typing in google spreadsheets, can validate answer of column within column using: '=if(len(b1)=25,b1,"wrong number of digits")'

which means return cell value if has 25 characters, if other amount wrong number, yet need use column...

is there way while typing in cell let me proceed if right number of characters or give error if have wrong number of characters, in same column?

untested

please try data, validation..., rule of: 

=and(b1>999999999999999,len(b1)=25)

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