Use `M-x find-grep-dired' interactively to search and replace a regex across all files in a specified directory and subdirectories which match a pattern.

Basic usage is:

# invoke, passing your search phrase ##M-x find-grep-dired RET catch (FooException RET##
# mark buffers of interest ##% m .php$ RET##
# invoke search and replace across the marked buffers ##Q catch (FooException RET catch (BarException RET##

At this point, Emacs will cycle through every match in every file and ask you to confirm the replacement. If you press ##!##, it will replace the rest of the matches in the current file, and start prompting you for the next; ##Y## will replace every match in every file with no further prompting. `M-,' restarts the interactive prompting if you break out of it.

Going back to the find-grep-dired buffer, and C-x s will save all changed files.

See DiredSearchAndReplace for more information.

See also DiredFindInLisp for `M-x find-grep-dired-lisp'.

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CategoryDirectories
CategorySearchAndReplace