Regular Expression Validator

Question

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i want to match anyone of below possibilities through a regular expression validator for a textbox
the user entry would be matched from these 3 patterns anyone of them would be considered valid

1. All four numbers but starting with digit 2 e.g 2000, 2300 etc
2. first four numbers starting with 2 and last one alpha bets between A-H e.g 2000C,2310B,2210G
3. first four numbers starting with 2 and last one alpha bets between A-H e.g 2000AC,2310GB,2000HD

what could be the possible regular expression of above scenario?
currently i am using: ([0-9]{4})|([0-9]{4}[A-H]{1})|([0-9]{4}[A-H]{2})
it matches only the first possibility i.e ([0-9]{4})on other two it is not working

Posted 5-May-13 21:19pm

Qadri Jillani

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Prasad Khandekar 6-May-13 3:28am

Try with this expression [0-9]{4}[A-H]{0,2}. It matches all possible cases. For regular expressions there is an excellent tool call Expresso. Grab it from here (http://www.ultrapico.com)

Regards,

Sergey Alexandrovich Kryukov 6-May-13 3:29am

Exactly. You could make it a formal answer; will you?
—SA

Prasad Khandekar 6-May-13 3:36am

Yes Sir,

Will do it immediately.

Regards,

Sergey Alexandrovich Kryukov 6-May-13 3:29am

"Not working" is not informative...
—SA

2 solutions

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André Kraak · Accepted Answer · 2013-05-05T21:43:00

Solution 2

Solution 1 is correct, but please note that [0-9]{4} is incorrect for the first criteria. [0-9]{4} also matches a value like 1000.
The regular expression for a four digit numbers starting with the digit 2 is 2[0-9]{3}.

So the final expression would be

2[0-9]{3}[A-H]{0,2}

Posted 5-May-13 21:43pm

André Kraak

Comments

Prasad Khandekar 6-May-13 3:51am

Oops, You are absolutely right. Thank's for pointing out the mistake. Please downvote my solution for proving the wrong answer.

Sergey Alexandrovich Kryukov 6-May-13 10:33am

5ed.
—SA

Prasad Khandekar · Accepted Answer · 2013-05-05T21:38:00

Hello,

Try with this expression

^(2[0-9]{3}[A-H]{0,2})$    // as partly suggested by (André Kraak)

It matches all possible cases.

For regular expressions there is an excellent tool called Expresso ^]. Grab it.

Regards,

[Edit: Using ^ and $ checks that the whole line contains only what you are looking for. Otherwise you'd get a match on anything with extra characters.
E.g. these would match:
"somerandomchars2000AC" if you don't include ^
"2000ACxyxblahandthing" if you don't include $
"somemore2000ACrandomchars" if you don't include either.

Also, I've put the expression in brackets to create a group, as per your question, allowing you to use group syntax to obtain the matched string ($1).
Regards,
Ian.]