Help me with Regular Expression please

[Anon]

$num is a telephone number variable and I want to check that the content of $num is
ONLT either any digit, one whitespace, +, or -.

I suppose that when I find a regular expression for these I can invert it to spot irregulaities.

A bit urgent.

[Anon]

No need to invert anything: just say

ereg('^[0-9-+ ]$',$string);

That's if it's only a single char. But I think you might have meant a sequence of the above, which is just:

ereg('<sup>[0-9-+ ]+$',$string);

Note the single quotes.</sup>

[Anon]

I solved it slightly differently, but big thanks to you Kirk anyway.

Here's the function:

Function validphonenr($num="")

validphonenr(): returns TRUE or FALSE depedning on criteria

{
if ($num == "")
{

the num can be empty

return TRUE;
}

## if the num is not empty then check it
$regex = "^(\+|[0-9])([0-9[:space:]-])+$";
if (ereg( $regex, $num ) )
{
	return TRUE;
}
else
{
	return FALSE;
}

}

This returns true on:
[phone]
[phone]
0208-07872521
0208-078 72 5 21
020807872521
etc.

But not:
44+0708870654
+44*0708-870-654
A0654054064064
0044 (0) 207 54 654 646
mob: [phone]
etc.

However, the Regex doesn't control double whitespace.
I know that I can put [:space:]{1}.
The means that: "020 8454654" will fail.
But wouldn't then also "020 8454 654" also fail? I'll give it a try.