Regex Help

This one is driving me nuts. I'm trying to virtualize a certain branch in TS to redirect all requests except for aspx pages. However, I'm having difficulty defining a regex strict enough that will exclude only aspx pages. This is what I have (which of course doesn't work):

^/iw-mount/default/main/IT%20Practice/CIO/[^/]+/CIO/MFWEB/CIO/(.*)([^\.aspx])$

Since the brackets individuate characters, this is not strict enough. I've read about using "?!" but it doesn't seem to help. However, I can accurately use "?!" as punctuation to express my sentiment with this.

Thanks!

Dave

Find more posts tagged with

Comments

Migrateduser

This is far from pretty but it's much closer to what I need:

^/iw-mount/default/main/IT%20Practice/CIO/[^/]+/CIO/MFWEB/CIO/([^\.]+)\.(([^a]?)([^s]?)([^p]?)([^x]?)*)$

This expression matches anything other than an aspx file extension, which is good, but it also doesn't match when the file extension has characters after "aspx" and it doesn't match permutations of "aspx".

In a real-life scenario, this is probably fine but could someone advise if there's something more strict than this?

Dave

ISCBorisB

This is far from pretty but it's much closer to what I need:

^/iw-mount/default/main/IT%20Practice/CIO/[^/]+/CIO/MFWEB/CIO/([^\.]+)\.(([^a]?)([^s]?)([^p]?)([^x]?)*)$

This expression matches anything other than an aspx file extension, which is good, but it also doesn't match when the file extension has characters after "aspx" and it doesn't match permutations of "aspx".

In a real-life scenario, this is probably fine but could someone advise if there's something more strict than this?

Dave

Something like the following should be stricter

^/iw-mount/default/main/IT%20Practice/CIO/[^/]+/CIO/MFWEB/CIO/.*([^\.].{4}|\.[^aA]...|\..[^sS]..|\...[^pP].|\....[^xX])$

TS Configurations do not like *lookaround assertions* and without them "match unless..." is never pretty

Migrateduser

Thank you, that is much better! So good in fact, I don't see any problems with it at all so maybe that's as strict as it can be. I know that regexes rarely win beauty contests but I was hoping (and researching and found quite a lot of bad information) that there was an operator that would have said something like "NOT this group of characters, in sequence" but no luck.

Thanks again,

Dave

ISCBorisB

Thank you, that is much better! So good in fact, I don't see any problems with it at all so maybe that's as strict as it can be. I know that regexes rarely win beauty contests but I was hoping (and researching and found quite a lot of bad information) that there was an operator that would have said something like "NOT this group of characters, in sequence" but no luck.

Thanks again,

Dave

Such animal does in fact exist. In regex lingo it is called "assertions"(4 flavors), see some discussion [thread=18640]here[/thread].
Problem is, IWOV (at least in TS and OD) does not honor assertions in configuration Files regexes.

Migrateduser

Aha, ok -- that makes more sense to me now, thank you. I had tried using a lookaround but it actually didn't even work in my regex tool, Regex Coach, which is otherwise wonderful.

Dave