Fellow monks, This unfortunatly is another regex question, I have tried searching for previous postings but it has yielded nothing. There are just too many postings regarding regex!

I want to check that a certain string has only letters (upper and lower) and optional commas.

• Commas should never be next to each other
• A comma at the end of the string is not allowed
• A comma at the start of the string is not allowed

Valid strings

• "notalot"
• "england,rugby"
• "chicken,egg,duck,feet"

Invalid Strings

• ",southampton"
• "bristol,"
• "iran, canada,france"
• ""

I tried the following but had no luck...

unless ($txt_collection =~ /([a-zA-Z]|([a-zA-Z],))+/) {
    print "<font color=\"#ff0000\"><i>Incorrect format</i></font>";
    $errors ++;
}
[download]

thanks for your time

-M

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