Regular Expression (Pattern Matching)

This is a discussion on Regular Expression (Pattern Matching) within the C++ Programming forums, part of the General Programming Boards category; Hi all, am trying to interpret the following Code: if(!getEmail().matches("^[a-zA-Z][\w\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\w\.-]*[a-zA-Z0-9]\.[a-zA-Z][a-zA-Z\.]*[a-zA-Z]$")) { errors.add("name",new ActionMessage("email.invalid") ); } and my interpretation is Code: ...

  1. #1
    Registered User
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    Apr 2008
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    Regular Expression (Pattern Matching)

    Hi all, am trying to interpret the following

    Code:
    if(!getEmail().matches("^[a-zA-Z][\\w\\.-]*[a-zA-Z0-9]@[a-zA-Z0-9][\\w\\.-]*[a-zA-Z0-9]\\.[a-zA-Z][a-zA-Z\\.]*[a-zA-Z]$"))
    {
                  errors.add("name",new ActionMessage("email.invalid") );
    }
    and my interpretation is
    Code:
    ^[a-zA-Z] must start with a letter(s)
    
    [\\w\\.-]* can be followed by  a number of characters including/ending with a dot or hyphen
    
    [a-zA-Z0-9]@ must have a letter(s) and should be followed by '@'
    
    [a-zA-Z0-9][\\w\\.-]*[a-zA-Z0-9] same as above (a string which may contain a dot or hyphen
    
    \\. a dot must exist 
    
    [a-zA-Z][a-zA-Z\\.]*[a-zA-Z]$" a string which may contain a dot but must end with word characters
    Have a question, does these dots [\.] within brackets suggests that i can have dots in my address i.e email.address-01@my.own.company.com ?

  2. #2
    Registered User Kernel Sanders's Avatar
    Join Date
    Aug 2008
    Posts
    61
    Yes. It's saying that there are any number of strings made of letters, separated by '.'s

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