Best group member,

 

I want to match a four digit number. I allow user to enter with * syntax. So
8* would match anything that starts with 8 and is 4 digit long so:

 

/^8[0-9]{3}$/

 

That was easy. Ok then my other case was: *8, so anything that ends with 8

 

/^[0-9]{3}8$/

 

Ok, now the tricky one comes: *8*, so match it incase 8 is anywhere in the
number. Can be beginning, end or in the middle. The problem that I face I
cannot find out a good way of doing this correctly. So I ended up with an
expression like this:

 

/^(8[0-9]{3}|[0-9]8[0-9]{2}|[0-9]{2}8[0-9]|[0-9]{3}8)$/

 

This takes care of it and everything, BUT it is so ugly. What I actually
need to construct is: A regular expression that checks if 8 is a part of the
number, and then that it is four digit long.

 

The pipe "|" is an OR operator, but are there not any "AND" operator in
Regular Expressions? I have been trying to figure this out for a while now.
Of course I am using the above syntax right now, but would like to strip it
down. Maybe not for the performance, but for the beauty of it :-)

 

If you have any comments and suggestions about this I would be happy. 

 

Best regards,

Peter Lauri

 

 <http://www.dwsasia.com/> www.dwsasia.com - company web site

 <http://www.lauri.se/> www.lauri.se - personal web site

 <http://www.carbonfree.org.uk/> www.carbonfree.org.uk - become Carbon Free

 

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