From my tests this feature is not working.
Tested on the fields where this could actually be used:

• ezstring
• eztext
• ezxml

Create a content object that has 1 of these fields and fill with:
"this is not working. 123---456 example@ez.no"

The following searches return the object:

• is this
• 123-456
• working@ez.no
• 123#this