[Tutor] Question about an re

[->Terry<-]

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Today (Oct 27, 2005) at 9:29am, Ed Singleton spoke these wise words:

- ->OR tests for the truth of the first thing then the truth of the second.
- ->
- ->The first part of your OR is always true, so it doesn't test the second.
- ->
- ->What you really want to do is look for a digit and then look for more
- ->digits or a slash and some more digits.
- ->
- ->So:
- ->
- ->: \d(\d+|/\d+)
- ->
- ->but this is easier by just allowing an optional slash in the digits:
- ->
- ->: \d+/?\d*
- ->
- ->ie 1 or more digits followed by 0 or 1 slashes followed by 0 or more digits.
- ->
- ->http://www.regular-expressions.info/ is a brilliant tutorial on regexs
- ->and http://www.weitz.de/regex-coach/ is a great program for testing
- ->them out before you put them in your code.
- ->
- ->Hope this helps
- ->
- ->Ed
- ->
- ->On 27/10/05, ->Terry<- <tvbare at socket.net> wrote:
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- ->> Hash: SHA1
- ->>
- ->>
- ->> os - Slackware
- ->> py - 2.4.1
- ->>
- ->> I'm trying to grab the value 10 in
- ->>
- ->> Visibility: 10 mile(s):0
- ->>
- ->> but sometimes the value looks like
- ->>
- ->> Visibility: 1/2 mile(s):0
- ->>
- ->> My not working regex looks like
- ->>
- ->> re.compile(': \d+|: \d/\d')
- ->>
- ->> If I'm understanding right, this should match either or,
- ->> but it doesn't work for the fractional reading.

Ok, I get it now. Thanks for the help and the links Ed.

Works like a charm and I changed it to also grab another
variation I found thanks to your help.

Visibility: less than 1/4 mile(s):1

Thanks again,
- -- 
    Terry

     ,-~~-.___.     Terry Randall <tvbareATsocketDOTnet>
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