Hi, Can any help me with forming this regular expression

Need to check for the values falling in this criteria and flag them. meaning if place this in validator.xml (Struts Framework), i should be able to check for the condition if form value doesnot belong to the below mentioned criteria return true. 

N (numeric) (numeric) (numeric) (numeric) (numeric)
N (numeric) (numeric) (numeric) (numeric) (alpha)
N (numeric) (alpha) (anything in the last 3 characters)
NM (anything)
NY (anything)
NT (anything)
N (alpha or numeric) and ends with 1234 

Thanks

I'm not familiar with Struts, but this may help:

N\d{5} = N followed by 5 digits

N\d{4}[a-z] = N followed by 4 digits and a single letter

N\d[a-z].{3} = N followed by a digit a letter and 3 characters of any kind.

I shrunk the regex a little bit:

([nN]\d{5,})|([nN]\d{4}[a-zA-Z])|([nN]\d[a-zA-Z][\da-zA-Z][\da-zA-Z][\da-zA-Z])|([nNmM][\da-zA-Z][\da-zA-Z][\da-zA-Z][\da-zA-Z])|([nNyY][\da-zA-Z][\da-zA-Z][\da-zA-Z][\da-zA-Z])|([nNtT][\da-zA-Z][\da-zA-Z][\da-zA-Z][\da-zA-Z])|([nN][\da-zA-Z]4302)

If you have an option for case insensitive matching, you can replace your [a-zA-Z] with just [a-z], and your [nNmM] with [nm] or [NM]