fix regular expression to also match capital letters
fix regular expression to also match capital letters

example `\figurewidth` would work before due to only small letters
example `\figW` would fail/not match due to a capital letter

RPeschke/matlab2tikz,matlab2tikz/matlab2tikz,PeterPablo/matlab2tikz,egeerardyn/matlab2tikz,matlab2tikz/matlab2tikz,miscco/matlab2tikz,nidrosianDeath/matlab2tikz,egeerardyn/matlab2tikz,LJeub/matlab2tikz