import re
p = re.compile(r'^\d.*?\b\d{5}$', re.MULTILINE | re.DOTALL)
test_str = "asf aSD ikugfr jddc ghddfj gjn dfxg \nsdgal fghfh 16 rgjodrisgj frth fghsdf,\ndfghdf dfhgdh gho h ghdof 67676\n\nszdgfads\n2 adf dojosd hsh fghs, \nzfgdf dhgdzsfb dfgdz,\ndzgdzfvg 47564\n\nasdgasdg asdg\n4334 ersga errr ertgerfd ertera erers qereadf erfesfdc wefadfe, \nsfsdgfg-43647"
print(p.findall(test_str))
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