John Machin wrote:
On Jul 19, 12:04 pm, Andrew Freeman <[EMAIL PROTECTED]> wrote:
To show if valid:
if re.search(r'^[LRM]*$', 'LM'):
print 'Valid'
A couple of points:
(1) Instead of search(r'^blahblah', ...) use match(r'blahblah', ...)
(2) You need to choose your end-anchor correctly; your pattern is
permitting a newline at the end:
re.search(r'^[LRM]*$', 'LM\n')
<_sre.SRE_Match object at 0x00B9E528>
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Thanks for your pointers, however have a question regarding the first:
>>> import re
>>> def my_match(var): # my original
>>> if re.search(r'^[LRM]*$', var):
>>> print 'Valid'
>>> else:
>>> print 'invalid'
>>> def other_match(var): # your suggestion, I believe
>>> if re.search(r'[LRM]*$', var):
>>> print 'Valid'
>>> else:
>>> print 'Invalid'
>>>
>>> eg = 'LRLRLRLRLM'
>>> fg = 'LRLRLRNL'
>>> my_match(eg)
Valid # correct!
>>> my_match(fg)
Invaild # correct!
>>>
>>> other_match(eg)
Valid # correct!
>>> other_match(fg)
Vaild # INCORRECT, please explain
I believe other_match was your suggestion; to remove the ^
my_match is just a renamed version of my original function
Point 2:
Yes, I totally agree with you on point 2, let me try to combine my
knowledge and make a satisfactory function.
>>> def final_match(var):
>>> if re.search(r'^[LRM]*\Z', var): # replace $ with \Z to limit
newlines
... print 'Valid'
... else:
... print 'Invalid'
>>> final_match(eg)
Valid
>>> final_match(fg)
Invalid
>>> final_match(eg + '\n')
Invalid
So, in conclusion, is this function satisfactory?
def match(var):
if re.search(r'^[LRM]*\Z', var):
print 'Valid'
else:
print 'Invalid'
--
Andrew
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