Searching for Numbers

[gatward]

I am trying to conduct a search to find number string (eg 345) which may be located in either the Item Title or in the Item Text and UR refuses to find the items containing the number, yet searching for text which is the same field finds the Item. If I combine text and number then UR will find the Item.

Is UR unable to find text which are numbers or is there a setting which causes this behaviour.