[diegorbaquero]

This is expected, not wanted though, I would expect some semantic analysis translated into "shirt -stripes", but what you really mean is "solid color shirt". This is a tough one but surely something that can be tackled with research

[saagarjha]

shirt -stripes does not mean "solid color shirt", as the - operator looks for that text on the page, instead of performing a semantic "I don't want stripes".

[SAI_Peregrinus]

And "shirt without stripes" doesn't mean solid color shirt either. Could have spots. Could be Hawaiian print. Is plaid striped?

[leni536]

stripes are not the only pattern besides solid color.