import re
text_list = ['Industry / Gemany / PN M564839', 'Industry / France / PN: 575-439', 'Telecom / Gemany / P/N 26-59-29', 'Mobile / France / P/N: 88864839']
regex = r"/ P/?N:? ([\w-]+)"
res = []
for text in text_list:
matches = re.search(regex, text)
if matches:
res.append(matches.group(1))
print(res)
aW1wb3J0IHJlCnRleHRfbGlzdCA9IFsnSW5kdXN0cnkgLyBHZW1hbnkgLyBQTiBNNTY0ODM5JywgJ0luZHVzdHJ5IC8gRnJhbmNlIC8gUE46IDU3NS00MzknLCAnVGVsZWNvbSAvIEdlbWFueSAvIFAvTiAyNi01OS0yOScsICdNb2JpbGUgLyBGcmFuY2UgLyBQL046IDg4ODY0ODM5J10KcmVnZXggPSByIi8gUC8/Tjo/IChbXHctXSspIgpyZXMgPSBbXQpmb3IgdGV4dCBpbiB0ZXh0X2xpc3Q6IAoJbWF0Y2hlcyA9IHJlLnNlYXJjaChyZWdleCwgdGV4dCkKCWlmIG1hdGNoZXM6CgkJcmVzLmFwcGVuZChtYXRjaGVzLmdyb3VwKDEpKQoKcHJpbnQocmVzKQo=