Regex replace for String, 3 characters from the end -

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i have been able add space string in input field using following:

onkeypress="this.value=this.value.replace(/^(\w{5})(?=\w)/,'$1 ')"

but count start end of line, , add space after user input has stopped. i've tried onblur, not seem work in chrome.

any tips?

thanks

just guess - 

onkeypress="this.value=this.value.replace(/(\w{5})(?=\w$)/,'$1 ')"

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