Regular expression for Google app engine entity keys

Question

I found this post, and now i want to use that regular expression too What characters are allowed in a Google App Engine Key?

However, in my handler i write something like

('/xxx/[a-zA-Z0-9-_]', MyHandler)

but it doesn't work...when i try to access a link it says not found...i tried many variations but can't seem to make it happen...Help?!

EDIT : Thanks for the help guys...such a foolish mistake :)

Without seeing your code, this could be lots of things, but perhaps you meant `('/xxx/[a-zA-Z0-9-_]+', MyHandler)` — Jesse Rusak, Apr 07 '13 at 15:31
the problem is surely caused by the regular expression...because if i put something like "(\w+)"...everything works fine — Teshte, Apr 07 '13 at 15:32

score 3 · Answer 1 · answered Apr 07 '13 at 15:34

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Your handler currently allows only exactly one character. Also, for safety, the dash should always be at the end of a character class, lest it designate a range:

('/xxx/[a-zA-Z0-9_-]*', MyHandler)

answered Apr 07 '13 at 15:34

Tim Pietzcker

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score 3 · Accepted Answer · answered Apr 07 '13 at 15:34

Your regular expression matches just one character after the /xxx/ part. You need to specify that you want 1 or more by adding the + multiplier:

('/xxx/[a-zA-Z0-9-_]+', MyHandler)

Now your expression matches anything that has at least 1 character, not just 1 and nothing more.

score 1 · Answer 3 · edited May 23 '17 at 10:25

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Keys can also only be 500 bytes long, so I am using the following

pattern = re.compile('^[0-9A-Za-z._-]{1,500}$')
valid = bool(pattern.match('key-name-to-test'))

Old question, but I thought I would add this for future views.

edited May 23 '17 at 10:25

Community

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answered Jan 20 '14 at 13:36

roridge

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Regular expression for Google app engine entity keys

3 Answers3

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