How to change the default behaviour of multiple value seprator in search from Semi-colon to colon

How to change the default behaviour of multiple value seprator in search from Semi-colon to colon

For example:

If user want to search 2 part numbers, he/she would seprate those numbers with a Semi-colon.

What if i want to use colon or some orther character instead.

If i have some Document with "Colorant Name = AAA;111" & if i go to my search page try searching document with the value "AAA;111" system gives ZERO results.

Reason: System treats "AAA;111" as 2 values & returns NULL.