import re
texts = ['20220213-0000-FSC-814-SC_VIRG_REFBAL_PRES_NPMINMAX-v1.xml',
'20220213-0000-F814-SC_VIRG_REFBAL_PRES_NPMINMAX-v1.xml']
pattern = r'F(?:SC)?-?(\d{3})'
for text in texts:
match = re.search(pattern, text)
if match:
print (match.group(1))
aW1wb3J0IHJlCnRleHRzID0gWycyMDIyMDIxMy0wMDAwLUZTQy04MTQtU0NfVklSR19SRUZCQUxfUFJFU19OUE1JTk1BWC12MS54bWwnLAonMjAyMjAyMTMtMDAwMC1GODE0LVNDX1ZJUkdfUkVGQkFMX1BSRVNfTlBNSU5NQVgtdjEueG1sJ10KcGF0dGVybiA9IHInRig/OlNDKT8tPyhcZHszfSknCmZvciB0ZXh0IGluIHRleHRzOgoJbWF0Y2ggPSByZS5zZWFyY2gocGF0dGVybiwgdGV4dCkKCWlmIG1hdGNoOgoJCXByaW50IChtYXRjaC5ncm91cCgxKSkKCQoJ