You can search for text string in an internal editor. Use toolbar command Find or keyboard shortcut
Type string to search for into Find what box.
Check Match whole word only not to allow string to be matched within longer word.
Check Match case if only string with exactly matching case should be found.
Use Up/Down to change direction of search.
Press button Find next to start searching. If occurence of the string is found, view will be scrolled to reveal the string and the string itself will be highlighted. You can press it repeatedly to search for other occurences.