Accent character problem

[Sallu]

Hi all and one
i wrote this script, working fine without fail( just run it)

import re
value='This is Praveen'
print value
#value = 'riché gerry'
#words=str(value.split()).strip('[]').replace(', ', '') ( here i tried
to convert in to list and then back to string)
#print words
richre=re.compile(r'[a-zA-Z0-9]')

if(richre.match(value)):
  print "Valid"
else:
  print "Not allowed special characters"

Output 1: (Fair)
This is Praveen
Valid
but when i change the value like
value='éhis is Praveen'
then

Output 2:(Fair)
éhis is Praveen
Not allowed special characters
 (because i wanted to check out the ascent(é) character so its working
fine no issue)

but when i give ascent(é) character in middle like
value='This és Praveen'

Output 3:(not fair)

This és Praveen
Valid
even it have ascent character it should display message "Not allowed
special characters"
Please help me out.
Thanks