import re
pattern = r"UsingDirectiveDecl\s0x[a-f0-9]{7}\s+<simple\.cpp:[0-9]+:[0-9]+,\s[a-zA-Z]+:[0-9]+>\s[a-zA-Z]+:[0-9]+\sNamespace\s0x[a-f0-9]{7}\s'[^']*'"
s = ("test | |-UsingDirectiveDecl 0x16de688 <line:58:3, col:24> col:24 Namespace 0x16de588 '__debug' test\n"
"test |-UsingDirectiveDecl 0x1e840b8 <simple.cpp:2:1, col:17> col:17 Namespace 0x1378e98 'std' test")
print(re.findall(pattern, s))
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