[find any combination in any order of specific characters.]

Thanks Jacques, it worked perfectly.

I have a follow up question, lets say I am also certain that there is going to be less than 4 alphabetical characters there and I want to match that as well for example my  string would be:

 

$string = "1423/3838/894789BLAH/9387";

or 

$string = "/73636/83/398/3BLAH";

or 

$string = "BLAH3//33/3838/7474/"

or 

$string = "/BLAH";

or 

$string = "636BLAH"

 

AND NOT because there are more than 4 alphabetical characters:

$string = "BELABELA3434";

 

I modified your code as follow but it didn't work.

'~\\A[\\d/\S{0,3}]+\\z~'

[find any combination in any order of specific characters.]

Hi everybody

I am trying to figure out a regex that match any combination/order of digits and backslashes for example it should matches all the following strings:

 

$string = "1423/3838/894789/9387";

or 

$string = "/73636/83/398/3";

or 

$string = "3//33/3838/7474/"

or 

$string = "/";

or 

$string = "636"

 

AND NOT:

$string = "a3434";

 

Any idea?