I'm new in DSP. I want to design single pass band FIR filter using LS method. I have this information :

• one pass band $[-0.1\pi , 0.3\pi]$

• two stop bands $[-\pi , -0.18\pi]$, $[0.38\pi, \pi]$

• weighting constant in :

pass band : $a = 1$ and stop band $b_1=b_2=2$.

In this case, can i using firls function? Because we have negative frequency and f is a vector of pairs of frequency points, specified in the range between $0$ and $1$.