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JavaScript

reg=/[^"]+\.(jpg|png|gif|bmp)/gi;
chaine1='{ \
	"DbgColor" : 60928,\
	"DbgIndex" : 2,\
	"DbgName" : "02___Default",\
	"colorAmbient" : [0.5882, 0.5882, 0.5882],\
	"colorDiffuse" : [0.5882, 0.5882, 0.5882],\
	"colorSpecular" : [0.0, 0.0, 0.0],\
	"illumination" : 2,\
	"mapAmbient" : "la image.jpg",\
	"mapDiffuse" : "la image.jpg",\
	"opticalDensity" : 1.5,\
	"specularCoef" : 10.0,\
	"transparency" : 0.0,\
	"transparent" : true\
	}';
chaine2='"materials": {\
 "nails": { "Kd": [251, 238, 209], "map_Kd": "la image.jpg", "Ks": [30,30,30], "Ns": 100 },\
    "skin": { "Kd": [207, 181, 161],  "map_Kd": "la image.jpg", "Ks": [30,30,30], "Ns": 30 }\
  },';
chaine3='<image id="la image.jpg" name="monster_jpg">';

console.log( chaine1.match(reg) )