[regex] Basic rewriting

[Gilles Ganault]

Hello

I've been reading tutorials on regexes in Python, but I still
don't get it:

========
#!/usr/bin/python

#myscript.py 0123456789

import sys,re

#Turn 0123456789 into 01.23.45.67.89
p = re.compile('(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)')
phone = p.sub('\1.\2.\3.\4.\5',sys.argv[1])
print phone
========

=> Python displays "...." instead. Any idea what I'm doing wrong?

Thank you.

 

[Tim Chase]

I've been reading tutorials on regexes in Python, but I still

don't get it:

========
#!/usr/bin/python

#myscript.py 0123456789

import sys,re

#Turn 0123456789 into 01.23.45.67.89
p = re.compile('(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)')
phone = p.sub('\1.\2.\3.\4.\5',sys.argv[1])
print phone
========

=> Python displays "...." instead. Any idea what I'm doing wrong?

Looks like you need to use "raw" strings of the form

r'...'

Otherwise, you'd need to escape every backslash so that the
regexp parser actually gets it. Thus you can either do this:

p = re.compile(r'(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)')
phone = p.sub(r'\1.\2.\3.\4.\5',sys.argv[1])

or the much more hideous:

p = re.compile('(\\d\\d)(\\d\\d)(\\d\\d)(\\d\\d)(\\d\\d)')
phone = p.sub('\\1.\\2.\\3.\\4.\\5',sys.argv[1])

HTH,

-tkc

 

[J. Clifford Dyer]

Hello

I've been reading tutorials on regexes in Python, but I still
don't get it:

========
#!/usr/bin/python

#myscript.py 0123456789

import sys,re

#Turn 0123456789 into 01.23.45.67.89
p = re.compile('(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)')
phone = p.sub('\1.\2.\3.\4.\5',sys.argv[1])
print phone
========

=> Python displays "...." instead. Any idea what I'm doing wrong?

Thank you.

Use raw strings for re expressions.

r'this is a raw string'
'this is not'

p = re.compile(r'(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)')
phone = p.sub(r'\1.\2.\3.\4.\5',sys.argv[1])

Should clear up your problem.

 

[Gilles Ganault]

Use raw strings for re expressions.

Thanks guys for the prompt reply Solved it.