regular expression question?

[markshen2004]

Hi there

I need write a regular expression for ASP programming.I have to search according to the conditions.

- 8 characters maximum
- Position 1 (if it exist) -- numeric only
- Position 2 (if it exist) -- alpha-numeric -- "1 - 0; A - R;"
- Position 3 (if it exist) -- alpha-numeric -- "1 - 0; A - Z;"
- Position 4 - 8 (if they exist) -- numeric only

I write it as /[0-9][1-0A-R][1-0A-Z][0-9]{1,5}/. but I do not know why it doesn't work.

Please give me some idea to modify it.

Thanks a lot

 

[Nevermoor]

That is a lot of flixibility in the string.

I think this will help:
/^[0-9]?[1-0A-R]?[1-0A-Z]?[0-9]{1,5}$/

^ = start of input
$ = end of input
? = 0 or 1 times

 

[vbkris]

one small change:
/^[0-9]?[1-0A-R]?[1-0A-Z]?([0-9]{1,5})?$/

nevermoor: the numbers also may not exist...


Known is handfull, Unknown is worldfull

 

[Tarwn]

I'm a little confused, how can you have a requirement that may not exist?
I mean if character one doesn't exist, doesn't that mean that there can't be a character 2, 3, 4, etc? Otherwise they would be called character 1, 2, 3, etc.
I can kind of see how your string could be 0 to 8 characters as long as they each follow their own rules based on their position, or is it possible to us a blank to skip a character? (or something like that)

Even so, the above expressions will accept things like:
AA5 because it can say 0 of the first group, 1 of the 2nd, 1 of the 3rd, 1 of the 4th.

Also, I don't believe 1-0 is a vlid range of characters, it would need to be 0-1 or even just 01.

If you mean for the pattern to hold from 0 to 8 characers, but always in that format, you may need to look at something like:
^([0-9]([01A-R]([01A-Z]([0-9]{0,5})?)?)?)?$

Now the lineup should be more correct. If there is a blank string everything is good.
If there is one character it has to be [0-9], two characters it would have to be [0-9][01A-R], etc

At least I think thats it, someone correct me if I missed something. The concept should be correct though. You need a way to cancel out all later groups in th event that an earlier group has a character it should match against. The previous solutions allowed you to skip groups that didn't match, which would allow incorrect strings of less then 8 characters.

-T

[sub]01000111 01101111 01110100 00100000 01000011 01101111 01100110 01100110 01100101 01100101 00111111[/sub]
Need an expensive ASP developer in the North Carolina area? Feel free to let me know.

 

[vbkris]

>>I'm a little confused, how can you have a requirement that may not exist?

thats something i thought, but who konws???

Known is handfull, Unknown is worldfull