now, Im not trying to rip on anything, I just want to point out two seperate ways to do this (my regex example might not be the best way to do it though.)

alias ra say $replace($1-,a,2a,b,3b,c,4c,d,6d,e,12e,f,13f,g,14g,h,15h,i,2i,j,3j,k,4k,l,6l,m,12m,n,13n,o,14o,p,2p,q,3q,r,4r,s,6s,t,12t,u,13u,v,14v,w,15w,x,2x,y,3y,z,4z)

alias ra {
.echo -q $regsub($1-,/(.)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)(.?)/ig,0\11\22\33\44\55\66\77\88\99\1010\1110\1111\1212\1313\1414\1515\16,%text)
say %text
}

personally, Id combine them all into the single replace method for each alias... just makes it a little faster, since you\'re only making one call to $replace, instead of 26. However, the $regex method, wont change the case of characters, where the replace would replace K with k