Question

I would like to have a regular expression that matches:

• Arabic letters.
• List item
• English alphanumeric.
• 3 Spaces maximum.
• 4 Underscores maximum.

Any order.

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I tried varies solution but couldn’t solve it.

Here is what i have now:

preg_match('@^([^\W_]*\s){0,3}[^\W_]*$@', $username)

The above expression allows:

• 3 spaces maximum
• English alpanumerics
• No underscore allowed

Answer 1

I don’t know about arabic characters, but the following regexp should match the others

([a-zA-Z0-9]{1,})\s{0,3}_{0,4}

This will match
(Alphanumeric)(0-3 spaces)(0-4 underscores)

If there are more than 4 underscores, the last ones will be omitted
If there are more than 3 spaces then the part after the 3 spaces will be ignored.

EDIT:
For arabic letters: First declare a string containing all arabic letters
so you’ll have

$arabic='all_arabic_letters';

Then your regexp string will be

$regex='[' . $arabic . ']{1,}([a-zA-Z0-9]{1,})\s{0,3}_{0,4}';

And match it as follows:

preg_match($regex, $username);