How can I remove all alphabetic characters?

[HALBURN]

I want to retain all numbers, hyphens, and decimal points.

Thanks.

[brian rich]

filter(<textToFilter>;"0123456789.-") ?

[HALBURN]

Perfect. Thanks very much.

[LaRetta]

It seems you want only 'number' characters?  You might also use:  GetAsNumber ( theField )  or if this is auto-enter, GetAsNumber ( Self )

 

But if you wish to retain numbers, you might change to type number; knowing the purpose of the request helps a bit here, i.e. whether needing to retain leading zeros etc. in which case GetAsNumber() would not work.