TextSearch

Deskbar:		No entry, normally launched via Tracker Add-on
Location:		/boot/system/apps/TextSearch
Settings:		~/config/settings/TextSearch

TextSearch looks for a string in text files. Typically it is invoked from Tracker's Add-on context menu on the selection of files or folders you want to search.

You enter a search string in the text box on top and hit ENTER or click Search to start. If Show lines is checked, the hits are automatically expanded to show the lines of the file containing the search string.

Only a few words on some of the otherwise self-explaining menu items:

File menu
New window		ALT N		Opens a new window where you can enter another string and search through the same files/folders.
Set target…		ALT F		Lets you choose a new set of files and folders to search through. Alternatively you can drag and drop files/folders into the window.
Action menu
Trim selection		ALT T		Removes all entries from the list that are not currently selected.
Open selection		ALT O		Opens the currently selected files with their preferred application (same as a double-click). If it's a text editor supporting it (like Pe), you can jump to the exact line the search string was found.
Show files in Tracker		ALT K		Opens the location of the currently selected files in Tracker.
Copy text to clipboard		ALT B		Copies the current selection to the clipboard.
Settings menu
Skip folders starting with a dot				This is useful when working in a "unixy" environment, where often administrative files are hidden inside ".folders/". Source versioning systems like SVN and CVS are examples of applications using this and are also widely used in Haiku.
Regular expression				TextSearch uses the command line tool grep. For it, special characters like '"*\$?! and spaces have to be escaped with a \. Activating this setting means you have to do this yourself, but in exchange grants you the power of regular expressions.
Text files only				TextSearch is currently only useful for finding strings in plain text files. Deactivating this setting will have it look through any kind of file anyway.
Open files in code editor				Forces files to be opened in the preferred code editor (that handles text/x-source-code). Otherwise a file will be opened in whatever app is set for its filetype. Useful, for example, when editing HTML files that normally would open in your browser.
History menu
				Contains recently used search strings.
Encoding menu
				Lets you choose different character encodings if needed.