Need help defining a regex pattern

I am building a C# application and one of the requirements is that I find values that match the pattern below...

Starts with an AB or lower case ab
Has 6-9 numerical values after the aA
Ends with YZ or a lower case yz

I was expecting something like the following to work but I know it's not right because it isn't working
^[abAB][0-9][yzYZ]$

An example of the value I am trying to match is ab665897yz or ab6658975yz

Any help is appreciated!
J CAsked:
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Rgonzo1971Commented:
Hi,

pls try
^(ab|AB)\d{6}(yz|YZ)$

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REgards
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ozoCommented:
^(ab|AB)\d{6,9}(yz|YZ)$
1

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Rgonzo1971Commented:
Corrected code
^(ab|AB)\d{6,9}(yz|YZ)$

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mccarlIT Business Systems Analyst / Software DeveloperCommented:
What about if it has mixed case? i.e.  Ab123456yZ

If that should be allowed too, then try this..

^[Aa][Bb][0-9]{6,9}[Yy][Zz]$

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Dirk StraussSenior Full Stack DeveloperCommented:
The pattern you want is:
(?i)(ab)(\d[0-9]{5,8})(?i)(yz)

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Use Regex Storm to test your regular expressions. It's a brilliant (free) online tool.
Here is the link to your pattern, so you can see it in action and play around with the results.
Also have a look at the handy Regex Reference on the site.
Regex Storm ResultsTherefore, from your requirements:
Starts with an AB or lower case ab - (?i)(ab) matches only A or B and ignores casing
Has 6-9 numerical values after the aA - (\d[0-9]{5,8}) finds \d decimals between [0-9] 0 and 9 only if there is a minimum of 6 and a maximum of 9 numbers {5,8} in the string. I assume it's 0-based, hence the 5 and 8 instead of 6 and 9.
Ends with YZ or a lower case yz - (?i)(yz) as the beginning, case insensitive matches A or Z.
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Regular Expressions

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