tags and group names

Group names and tags must be a string of alpha numeric words.  The words cannot be separated by more than one space.  They cannot contain any punctuation or wierd characters.  These only allowable characters are:
   
                a-z  0-9  ~ @ $ - _

The string cannot be more than 25 characters long.

Upper case letters will be converted to lower case letters.

This allows considerable lattitude for naming groups and tags.  However it is strongly suggested that multiple words and long names be avoided.  The shorter and simpler the name the more effective and nmeonic ti will be. 

Here is the exact algorithm to validate names that is going into testing.




function isName ($string) {
    global $error, $revised;
    $error="";
    $revised=strtolower(trim($string));
    if (strlen($revised)>25)  {
        $error=sprintf('Name cannot be greater than 25 characters. It was %s.',strlen($revised)) ;    
        return false;}
    # Allow alpha numeric words separated with single spaces
    # Only special characters allowed are:  ~ @ $ - _
    $pattern="@^(link|(\ ){1,1}link)+@";
    preg_match($pattern, $revised, $matches);
    if ($matcheslink==$revised) return true;
    return false;
}

Please comment only if it directly pertinant to these definitions or the algorithm. 

Tags

  1. groups
  2. syntax
  3. algorithms

Comments

Seth says
unfortunately the square bracket reference parser garbeled my regex pattern ... if anyone is interested i can post it as a text file
Mark de LA says
Is there anything magick about the the number 25 ?
Mark de LA says
Can use multiple spaces but not in a row ?
Seth says
nothing magic about 25 except that it is about the longest that i want to tolerate
Seth says
mark: Can use multiple spaces but not in a row ?

Yes.  Is that not implied by "The words cannot be separated by more than one space. "  ?
Mark de LA says
"words cannot be separated by more than one space"
Was ambiguous if you put the emphasis on "one space".  I was getting the idea that you could possibly only have one space in the entire name. Just teasing it out of the cosmick ooze.

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