To locate specific text in multiple files, pick Search > Find in Files 
.
Text to find
Enter the text to search for.
Folder
Enter the name of the folder to search in.
File mask
Enter the mask of files to include in the search.
Match character case
Match only text with the same uppercase and lowercase characters.
Whole words only
Match on the whole words but not parts of words.
Regular expression
Indicates the search string is a PCRE regular expression. Click on the Insert Regular Expression Element 
button to pick from a list of common regular expression terms. Click the RE Examples button for more info.
Search subfolders
Recursively searches folders within the main one.
