Let \(f(x)=\begin{cases}|x-3|, & \text{if } x<-1\\ 3x+4, & \text{if } x\geq -1\end{cases}\), \(g(x)=x^{2}-\mathrm{b}x-2\ (x\in\mathbf{R})\) and \(\mathrm{b}\) is a real constant. If \(g\circ f\) is continuous at \(x=-1\), then \(\mathrm{b}\) is equal to ________.