How can I search for a text inside a specific field

Matrix includes a query language called MRQL (Matrix Requirements Query Language) or Miracle in short (smile) 

One of its use is to search for a text in a specific field. For example to look for a Version field that contains the string "1.5" you can enter this into the search field, then press enter:

mrql:Version ~ "1.5"

More information about MRQL: MRQL