只提取--beginning开始到第一个[end]之间的一段。其他不要，该怎么做？

Question

bug.txt--beginning50-23 2323 dsfal ksldfklad ds ljk sdklfjl aklsdjlf kl 90 jklsdj- klajsdl kldafjklskdlfjksdl......[end]sdkljfkls ksldfjlsd l jklsdjflasdf ljsdflsdsdfsdf 8923749 89 89wejklj 9808 ljldf sdlfj u789890 kjsdklf ...[end]

Answer 1

import re
s=open(r"bug.txt").read()
regexpr=re.compile(r"beginning(.*?)\[end\]",re.DOTALL)
result=regexpr.search(s)
try:
print result.group(1)
except:
print "Can't find match string"

Answer 2

--beginning(.*?)\[end\]