Regex With Asp.net Mvc StringLength Attribute

Question

I have Asp.net mvc application where on submit form i am using Regex and StringLength Attribute to check string.Scenario is that i allow some kind of codes but their lengths are different. My Class item regex and attribute is here:`

[StringLength(13,ErrorMessage="Allowed 13 or 12 Characters",MinimumLength=12)]      
[RegularExpression("^(01|04|05|06|pt|pT|Pt|PT|fg|fG|Fg|FG)[0-9]*(FR|fr|Fr|fR)?$", ErrorMessage = "Entered Format Is Incorrect")]
public string BarCode { get; set; }

the problem is that barcodes FG,01,04,06 are 12 in length when PT codes length must be 13. ussualy users use PT codes 90%.. sometimes they insert 12 length PT codes and its mistake. can i have 2 regex same time? and can i validate length for particular codes in regex?.i think [StringLength(13,ErrorMessage="Allowed 13 or 12 } atrribute is not what i need here..

You cannot have 2 [RegularExpression] attributes, but you can have a single regex that allows bar codes containing FG to contain 12 characters and those containing PT to containing 13 characters (using an |), and delete the [StringLength] attribute — user3559349
– user3559349, Commented Feb 5, 2018 at 12:30
Try something like this, but note that FR at the end that is optional will not count here. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Feb 5, 2018 at 12:32
Perhaps, ^(?:(?:[Ff][gG]|0[146])(?=.{10}$)|(?:05|[pP][Tt])(?=.{11}$))[0-9]*(?:[Ff][rR])?$ will work exactly as you need. — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Feb 5, 2018 at 14:41
big thnx Wiktor Stribiżew - everythings works fine but ,if i will have code that starts with three symbols like KLM07489869FR--length 13,how can i add it to your regex?we are going to add this code later.ofc i am trying by myself but i dont want to mess all your good stuff. — R01
– R01, Commented Feb 6, 2018 at 7:43

Wiktor Stribiżew · Accepted Answer · 2018-02-06 08:00:44Z

You may use

^(?:(?:[Ff][gG]|0[146])(?=.{10}$)|(?:05|[pP][Tt])(?=.{11}$))[0-9]*(?:[Ff][rR])?$

See the regex demo.

Explanation:

^ - start of string
(?: - start of a non-capturing alternation group
- (?:[Ff][gG]|0[146]) - either an fg, Fg, fG or FG sequence or 0 followed with 1, 4 or 6
- (?=.{10}$) - a positive lookahead that requires any 10 more chars immediately to the right of the current location (10 is used because FG or 01 already take 2 chars making 12 in total)
- | - or
- (?:05|[pP][Tt]) - 05, pt, Pt, pT or PT
- (?=.{11}$) - a positive lookahead that requires any 11 more chars immediately to the right of the current location
) - end of the alternation group
[0-9]* - 0+ digits
(?:[Ff][rR])? - an optional sequence (1 or 0 times), fr, Fr, fR or FR
$ - end of string.

Now, adding KLM07489869FR format support (KLM is 3 char long, thus the rest must be 10, so we place the KLM matching part to the alternative with (?=.{10}$)):

^(?:(?:[Ff][gG]|0[146]|[Kk][Ll][Mm])(?=.{10}$)|(?:05|[pP][Tt])(?=.{11}$))[0-9]*(?:[Ff][rR])?$
                       ^^^^^^^^^^^^

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