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Try this if you don't want to reset the index position for each line...

awk '{ for(i=1;i<=NF;i++)
{ if(index($i,"alice")!=0)
printf ("%d ",index($i,"alice") + len);
...

In case your awk version allows for string field separators, tryawk -vSRCH=alice '
BEGIN {LNS=length(SRCH)
}
{n=split ($0, TMP, SRCH)
m=0
for (i=1; i<n; i++) ...

You could also try something like:
#!/bin/ksh
printf '%s\n' 'bob alice robert alice' 'aaaa bbbb aaaa' | awk -v s="$1" '
{ d = ""
for(i = 1; x = index(substr($0, i), s); i = i + x +...

[akshay@localhost tmp]$ cat position.awk
function usage()
{
print "\n\tawk -f position.awk -vsearch='word_to_be_searched' infile\n"
exit
}
BEGIN{
if(!search)usage();
}
index($0,search){
...

Busybox uses its own implementation of awk, seemingly one that uses null-terminated strings internally (as opposed to length prefixed, which could handle null characters inside strings). I used...