Accept empty phone numbers

[Yo]

Hello,

I am new at XSD schema.
In a schema, I have a regular expression used to check a phone number.
This expression works, but I'd like to allow also an empty string for
phone numbers.

Is there a simple way for me to modify my regular expression for that
in my XSD schema ? And if not, how can I achieve it ?

Thank you for your help.

 

[Martin Honnen]

I am new at XSD schema.
In a schema, I have a regular expression used to check a phone number.
This expression works, but I'd like to allow also an empty string for
phone numbers.

Is there a simple way for me to modify my regular expression for that in
my XSD schema ? And if not, how can I achieve it ?

If you wrap your expression in
()?
e.g.
(\d{5} \d{4,10)})?
it should work I think.

 

[Yo]

Après mûre réflexion, Martin Honnen a écrit :

If you wrap your expression in
()?
e.g.
(\d{5} \d{4,10)})?
it should work I think.

That's exactly what I did while thinking by myself, and it works
perfectly. Thank you anyway for your idea ! ^^