Getting a textfield "name"&i?

I need to check 42 textfields from level0, they all are "re" and then their number between 1-42...

I thought of (of course):
for(i=1;i<43;i++) {
if( "re"&i ... )
....
}

And of course it doesn't work...
So how do I do this???

close but no cigar. here:

for(i=1;i<43;i++) {
if( _level0["re" + i] ... )
....
}

Thanks!
It worked!