regex - javascript regular expression replace in input form validation -

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when inputting string format:

the beginning r or r, non-digit letters, want replace string r.

it's in situation: 

onkeyup="this.value=this.value.replace(/^[rr]\d/g,'r')"

but not work.

somebody can me out? thanks.

use following regex:

     onkeyup="this.value=this.value.replace(/^[rr]\d+/, 'r')";

see demo:

<input onkeyup="this.value=this.value.replace(/^[rr]\d+/,'r')" />


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