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Posted by Steve Turnbull on 09/08/05 18:36
On Thu, 08 Sep 2005 09:15:03 +0100, Steve Turnbull wrote:
> On Thu, 08 Sep 2005 19:27:49 +1200, Jasper Bryant-Greene wrote:
>
>> Steve Turnbull wrote:
>>> I am trying to find a regular expression to match a variable, what I think
>>> should work (but doesn't) is;
>>>
>>> preg_match ('^/[\w],[\w],/', $variable)
>>>
>>> The $variable MUST contain an alpha-numeric string, followed by a comma,
>>> followed by another alpha-numeric string, followed by another comma
>>> followed by (but doesn't have to!!) another alpha-numeric string followed
>>> by nothing.
>>>
>>> I realise my regex above doesn't allow for the last 'followed by nothing',
>>> but to me it looks like it should match the first part of the string up to
>>> the last comma?
>>
>> Something like
>>
>> '/^\w+,\w+,\w*$/'
>>
>> maybe? (untested)
>>
>> http://php.net/reference.pcre.pattern.syntax
>
> Thats got me a lot further - thanks
>
> I reduced it slightly to '/^\w+,\w+,' because at the end there is the
> possibility of an alpha-numeric character(s) OR nothing at all with the
> exception of a possible line break (note possible)
>
> It's the 'possibly nothing at all' which I am slightly stuck on
>
> Thanks
> Steve
One more thing (I have tried researching myself and reading the o'rielly
book, but I need fairly swift solutions)...
How would I check for this scenario;
Two commas, which MAY have, but don't always have a value between, but
the commas must ALWAYS be there - i.e.
var1,var2,var3
var1,var2,
var1,,
Cheers
Steve
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