JSFiddle - React, Tailwind, and code Playground
JavaScript
reg=/[^"\\s]+\.(jpg|png|gif|bmp)/gi;
chaine='newmtl 03___Default\
Ns 10.0000\
Ni 1.5000\
d 1.0000\
Tr 0.0000\
Tf 1.0000 1.0000 1.0000 \
illum 2\
Ka 0.5882 0.5882 0.5882\
Kd 0.5882 0.5882 0.5882\
Ks 0.0000 0.0000 0.0000\
Ke 0.0000 0.0000 0.0000\
map_Ka la image.bmp\
map_Kd la image.bmp';
console.log( chaine.match(reg) )