How to Search and Replace Exclusively?

For example, I wanna search and replace all the "d" (a command defined by myself). But if I type it in the search bar, then all commands containing it pop up, such as "Di" and "dot". So how can I search and replace the commands(or words) exclusively?

PS: I’m using Texpad(MacOS) as the editor(following is a screenshot). If it does not support such a exclusive search and replacement, any other recommendation would be appreciated.