filtering using "natural" wildcard * ?

Hello,

I would like to filter my table using the wildcard * like this :
- if I write 40* the table shows only the lines which BEGINS by 40
- if I write 20 the table shows only the lines which ENDS with 20
- if I write *20 the table shows only the lines which CONTAINS 20

I tried the table.columns(id_col).search(this.value, true).draw() function and I can filter using regexp, it works perfectly... But I would like to allow the "natural" use of the wildcard * as described above. Is that possible ?

Many thanks !!

T.