read numbers only from text and numbers field

Hello,

i have field which contains text and numbers, i need to retrieve the numbers only from it.

example:

PlaceIndex

smr2003

smr2004

smr2005

i need to exctract placeindex by range.

exapmle:

{Place.PlaceIndex} in "2000" to "2999" by ignoring the text before numbers.

any idea?