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PHP Name Validation

Posted on 2007-11-25
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Last Modified: 2010-04-21
I need help creating a regex to validate either a first name or a last name (separate fields on my form).  Specifically:

1) The name must contain only letters, one space, a single apostrophe, or a single hyphen, or a single period;
2) If the name contains either an apostrophe, a hyphen, or a space, the apostrophe, hyphen, or space must be preceded and followed by at least one letter.
3) If the name contains a period, it must be preceded by a letter and followed by a space and letter.

Thanks.

Alan
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Question by:alanpollenz
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Expert Comment

by:evilrix
ID: 20348074
I think this'll do what you need...
^\w+((([ '-])|(\.[ ]))\w+)?$

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evilrix earned 2000 total points
ID: 20348083
This version is a little better as it doesn't do any capturing: -


^\w+(?:(?:(?:[ '-])|(?:\.[ ]))\w+)?$
 
Analysis: -
 
^ (anchor to start of string)
Any word character 
+ (one or more times)
Non-capturing Group
  Non-capturing Group
    Non-capturing Group
      Any character in " '-"
    End Capture
        or
    Non-capturing Group
      .
      Any character in " "
    End Capture
  End Capture
  Any word character 
  + (one or more times)
End Capture
? (zero or one time)
$ (anchor to end of string)

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Expert Comment

by:waygood
ID: 20349501
Just an observation, but there is a contradiction in your rules.

2. A space must be preceded and followed by at least one letter.
 eg  A_A  (_ is a space)
3. A period (non letter) must be preceeded by a letter and be followed by a space and a letter.
 eg A._A (_ is a space)

Since a space must be preceeded by a letter (not a period) all examples for rule 3 will be wrong for rule 2
I assume rule 2 should be "A space must be preceded and followed by at least one character"
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Author Closing Comment

by:alanpollenz
ID: 31410915
Thanks!  And waygood was correct regarding rules 2 and 3.
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Author Comment

by:alanpollenz
ID: 20350042
One thing I did notice was that when I put this into a function such as:

---------------------------------------------------------------------------------------

function allowed_name ($string) {
      $pattern="/^\w+(?:(?:(?:[ '-])|(?:\.[ ]))\w+)?$/";
      preg_match($pattern, stripslashes($string), $results); // any matches found will be arryed into results
      if ( '' <> trim(' ' . @$results[0]) ) {
            return true;
            }
      else {
            return false;
            }
      }

---------------------------------------------------------------------------------------

I had to use the stripslashes function to allow the apostrophe because in a name like O'Reilly it was passed as O\'Reilly and the match failed.

Alan
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Expert Comment

by:evilrix
ID: 20350048
Sorry -- I know not of PHP, just regexes :)
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Expert Comment

by:jnichols1
ID: 21525811
This is what I use the regular expression allows apostrophe's, underscores, a-z, 0-9, periods and splits at the @ symbol and allows two periods after it i.e. tool'omally@tool.co.uk or todd_head@tool.com

//validate the email
function validate_email($email)
{
// regexp for a valid email address
$regexp = "^(['_a-z0-9-]+)(\.['_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,5})$";

return (eregi($regexp, $email) > 0);
}
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