Output findrx to textbox what is readable

[freggel99]

I adapted something but i get a 'invalid index' error, this is my 'code'

ARRAY(str) c
findrx(s1 "\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}" 0 4 c)
int z
for z 0 c.len
out c[1 z]

Any idea what is wrong with it,