Matching C integer constants with re
Thomas Heller
theller at python.net
Thu Jun 12 04:39:55 EDT 2003
I'm trying to match C integer constants with the re module, but cannot
get it to work correctly.
This is the pattern I use:
re.compile(r"(0[xX][0-9a-fA-F]+|\d+)([uU]|[lL]|[uU][lL]|[lL][uU])?")
and it fails to match constants with a two character suffix like
these: "123ul" and "123lu", although "123u" and "123l" are found correctly.
Can anyone see what's wrong?
Thanks,
Thomas
PS: Here's the test script:
-----
import re
text = "123 0X123 123U 123L 123UL 0xabc2fUL 0xabc2fLU"
pattern = re.compile(r"(0[xX][0-9a-fA-F]+|\d+)([uU]|[lL]|[uU][lL]|[lL][uU])?")
for token in text.split():
match = pattern.match(token)
if not match:
continue
s, e = match.start(), match.end()
print token[s:e]
-----
and the output:
123
0X123
123U
123L
123U
0xabc2fU
0xabc2fL
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