Regex to match a 2-digit number to validate Credit Debit Card Issue number

Question

I would like to use regex to match a string of exactly 2 characters  and both of those characters have to be between 0 and 9  The string to match against would be coming from a single-line text input field when an ASP NET MVC view is rendered  So far  I have the regex   0-9  2    and from the following list of example string inputs       456     55 44     12   the following matches are returned when I apply the regex       45     5544     12   So  I have kind of half the solution    what I actually want to enforce is that the string is also exactly 2 characters long  so that from the list of strings  the only one that should be matched is  12   I am an admitted amateur at regular expressions and am just using this to validate a card issue number on an ASP NET MVC model as below       Required   RegularExpression   0-9  2     public string IssueNumber   get  set      I m sure that what i m asking is quite simple but I wasn t able to find any examples that limited the length as part of the matching    Thanks  in advance

User · Answer

Something like this would work     d 2

User · Answer

You can use the start     and end     of line indicators     0-9  2     Some language also have functions that allows you to match against an entire string  where-as you were using a find function  Matching against the entire string will make your regex work as an alternative to the above  The above regex will also work  but the   and   will be redundant

User · Answer

You need to use anchors to match the beginning of the string   and the end of the string      0-9  2

[regex] Regex to match a 2-digit number (to validate Credit/Debit Card Issue number)

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