RegEx Question in Python

Hi all,

I am beginning to dabble in some Python. I am trying to connect to a database so that I can build a table and then populate that table. Once I get this working then it will become a cron script. The purpose for this is to build citeria for searches against a database.

At any rate, here is my script so far:

                row = cursor.fetchone()
                if row==None:
                        break
                row = str(row)
                p = re.compile('[,()\']')
                row = p.sub('',row)
                p = re.compile('(PDB_[0-9])')

Now this is inside of a loop that is returning the names of databases from a query.  The database name takes the form of PDB_nnnnn(c), that's five numbers and an optional character. As you can see, I am trying to match on this pattern ( re.compile('(PDB_[0-9])') ) and this does work, except there are intermediate database files with stuff like _old, _tmp and such on the end of the PDB_nnnnn.

My question is how can I modify the re.compile('(PDB_[0-9])') to filter out those database names that have the _xxx on the end of them?

By the way, I am going against MySQL and to get all the databases I am issuing the query "SHOW DATABASES".


Thanks for your help

Paul
LVL 2
PaulS_IIIAsked:
Who is Participating?
 
rjkimbleCommented:
I overlooked one thing in my earlier post. It's better to use raw strings to define regular expresson patterns. My expression should be this instead:

re.compile( r'^PDB_\d{5}.?$' )
0
 
rjkimbleCommented:
To match the strings you describe, try this expression:

re.compile( '^PDB_\d{5}.?$' )

The ^ matches the start of the string, the \d matches any digit, the {5} modifies the \d to match exactly 5 digits, the .? matches any character 0 or 1 times, and the $ matches the end of the string.
0
 
PaulS_IIIAuthor Commented:
rj,
Absolutely perfect. Thank you so much for your input.
0
 
rjkimbleCommented:
You're welcome -- glad to help.

.... Bob
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.