Mahesh wrote:
I needed to get to the POST body and while I was trying out various regular expressions, one of them caused Python to hang. The Python process was taking up 100% of the CPU. I couldn't even see the "Max recursion depth exceeded message". Is this a bug?
no, it's just a very stupid way to implement a trivial operation.
import re
s = \ """POST /TradeManagement-RT3/ReportController.Servlet HTTP/1.1 /snip>
#pattern_str = "^POST.*\\r\\n\\r((\\n)|(\\n[^\r]*))" #pattern_str = "^POST.*\\n((\\n)|(\\n[^\r]*&))" pattern_str = "^POST(.*\\n*)+\\n\\n" # <--- Offending pattern
the first .* is a variable-length match. so is the second .*. and then you're putting it inside a repeated capturing group. and then you're applying it to a moderately large string. the poor engine has to check zillions of combinations before finding something that works.
if you want to split on "\r\n\r\n", use split:
header, body = message.split("\r\n\r\n")for more robust code, consider using the rfc822 module:
f = StringIO.String(message)
request = f.readline() header = rfc822.Message(f)
body = f.read()
</F>
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