Re: Question on re.IGNORECASE

2005-10-20 Thread Kent Johnson 
[EMAIL PROTECTED] wrote:
 Hi,
 
 I'm having some problems with basic RE in python. I was wondering
 whether
 somebody could provide a hint on what's going wrong with the following
 script. Comments are included.
 
 TIA.
 -myself
 
 
python2.3
 
 Python 2.3.4 (#1, Nov 18 2004, 13:39:30)
 [GCC 3.2.3 20030502 (Red Hat Linux 3.2.3-39)] on linux2
 Type help, copyright, credits or license for more information.
 
import re
pattern = re.compile('.*HTTP/(\d\.\d) *(\d*) *(.*)$')
pattern.search(GGHTTP/1.1 200 OK\r\n, re.IGNORECASE)
 
 _sre.SRE_Match object at 0xb75c6ed0
 
pattern.search(GHTTP/1.1 200 OK\r\n, re.IGNORECASE)
 
 # this makes no sense to me. Why is the previous line matched

Because the second argument to pattern.search() is the position where the 
search starts, not a flag. re.IGNORECASE == 2 so your search is skipping the 
first two chars.

Try giving the flags as a second argument to re.compile():
  import re
  re.IGNORECASE
2
  pattern = re.compile('.*HTTP/(\d\.\d) *(\d*) *(.*)$', re.IGNORECASE)
  pattern.search(GGHTTP/1.1 200 OK\r\n)
_sre.SRE_Match object at 0x00965980
  pattern.search(GHTTP/1.1 200 OK\r\n)
_sre.SRE_Match object at 0x009659D0
  pattern.search(Ghttp/1.1 200 OK\r\n)
_sre.SRE_Match object at 0x009651B0

Kent


 # and this not?
 
pattern.search(GHTTP/1.1 200 OK\r\n)
 
 _sre.SRE_Match object at 0xb758d020
 
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Re: Question on re.IGNORECASE

2005-10-20 Thread chemag 
OK, I got it.

- The re module search function syntax is:

search( pattern, string[, flags])

where re.IGNORECASE is a valid flag.

- The RE Object search method syntax is:

search( string[, pos[, endpos]])

where The optional second parameter pos gives an index in the string
where the search is to start; it defaults to 0

It turns out that re.IGNORECASE has the value
2.

Am I the only person bitten by this?

http://docs.python.org/lib/node115.html
http://docs.python.org/lib/re-objects.html

-myself

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Re: Question on re.IGNORECASE

2005-10-20 Thread chemag 
Thanks for your help. 

-myself

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