Eg. enter 'salesLine' in the Containing text field and click Find now.
But it can do more than that, it can match word with regular expression as well (but the search is slower).
Eg. Find in the 'SalesFormLetter' class 'run' method for any method containing 'salesFormLetter' at the front and 'Thread' at the end.
?* indicates occurrence of any characters for zero or more times
Eg. Find in the 'SalesFormLetter' class for the word '::After'
Eg. Find in the 'SalesFormLetter' class for the word 'proforma' followed by a space
Eg. Find in the 'SalesFormLetter' class for the word 'proforma' preceded by a space
Regular expression syntax in Dynamics AX: http://msdn.microsoft.com/en-us/library/aa886279(v=ax.50).aspx
