Searching for marked (selected) text in Emacs

I use emacs for viewing and editing code and other text files. I wanted to know if there is a way to search forward or backward for text which is marked in the current buffer. Similar to what I can do in notepad or wordpad. As in can I mark some text in the buffer and do a C-s or C-r and be able to search with the marked text without actually typing in the whole search text?

Thank you,

Rohit

@Alex nails it.

Another option I use quite often is C-s C-w to search for the word after the current mark. Hitting C-w repeatedly increases the search with additional words (e.g., C-s C-w C-w C-w searches for the 3 words after the current mark).

Similarly, C-s M-s C-e searches for the rest of the line after the current mark and C-s C-M-y searches for the character after the mark. These are both repeatable in the same way (the former by somewhat-awkwardly repeating M-s C-e after C-s).

Yes. M-W (to get a copy of the selected text) C-s <RET> C-y <RET>. Then repeat C-s as needed. Similarly for C-r.

I am using the following which does not have the problem of having to type more then one successive C-s to find later occurences:

    (defun search-selection (beg end)
      "search for selected text"
      (interactive "r")
      (kill-ring-save beg end)
      (isearch-mode t nil nil nil)
      (isearch-yank-pop)
    )
    (define-key global-map (kbd "<C-f3>") 'search-selection)

The disadvantage of the previous code is that the selected text is copied to the stretch. The following code does not have this problem:

    (defun search-selection (beg end)
      "search for selected text"
      (interactive "r")
      (let (
            (selection (buffer-substring-no-properties beg end))
           )
        (deactivate-mark)
        (isearch-mode t nil nil nil)
        (isearch-yank-string selection)
      )
    )
    (define-key global-map (kbd "<C-f3>") 'search-selection)

Other answers describe how to search for copied text, or how to search for the word at point. But none of them actually describe how to "search with the marked text."

Adding the following hook will make it so that the currently-selected text is the text used for an isearch:

(defun jrh-isearch-with-region ()
  "Use region as the isearch text."
  (when mark-active
    (let ((region (funcall region-extract-function nil)))
      (deactivate-mark)
      (isearch-push-state)
      (isearch-yank-string region))))

(add-hook 'isearch-mode-hook #'jrh-isearch-with-region)

Tip: This pairs nicely with expand-region.

The shortest key sequence to do this is M-w C-s M-y.

There is a great function for this: isearch-forward-symbol-at-point. It highlights all occurrences of the word where your point is located - no need to place the point at the beginning of the word. Then you can move to next or previous with C-s or C-r.

Note that it is an exact match: if you use it on hi it won't match chill for instance.

I mapped if to command-f (mac OSX): (global-set-key (kbd "s-f") 'isearch-forward-symbol-at-point) in the init file.

The answers above (including the accepted one) are too cumbersome IMHO. I found the following info and like it well better:

> “Ctrl+s Ctrl+w”. This will search the current word, but you must move > your cursor to the beginning of the word first.

http://xah-forum.blogspot.com/2009/08/search-word-under-cursor-in-emacs.html

You can find C-s help by doing C-h k C-s, and it says:

> Type DEL to cancel last input item from end of search string. Type RET > to exit, leaving point at location found. Type LFD (C-j) to match end > of line. Type C-s to search again forward, C-r to search again > backward. Type C-w to yank next word or character in buffer onto the > end of the search string, and search for it. Type C-M-w to delete > character from end of search string. Type C-M-y to yank char from > buffer onto end of search string and search for it. Type M-s C-e to > yank rest of line onto end of search string and search for it. Type > C-y to yank the last string of killed text. Type M-y to replace string > just yanked into search prompt with string killed before it. Type C-q > to quote control character to search for it. Type C-x 8 RET to add a > character to search by Unicode name, with completion. C-g while > searching or when search has failed cancels input back to what has > been found successfully. C-g when search is successful aborts and > moves point to starting point. > > If you try to exit with the search string still empty, it invokes > nonincremental search. > > Type M-c to toggle search case-sensitivity. Type M-s i to toggle > search in invisible text. Type M-r to toggle regular-expression mode. > Type M-s w to toggle word mode. Type M-s _ to toggle symbol mode. Type > M-s ' to toggle character folding. > > Type M-s SPC to toggle whitespace matching. In incremental searches, a > space or spaces normally matches any whitespace defined by the > variable ‘search-whitespace-regexp’; see also the variables > ‘isearch-lax-whitespace’ and ‘isearch-regexp-lax-whitespace’. > > Type M-s e to edit the search string in the minibuffer. > > Also supported is a search ring of the previous 16 search strings. > Type M-n to search for the next item in the search ring. Type M-p to > search for the previous item in the search ring. Type C-M-i to > complete the search string using the search ring. > > Type M-% to run ‘query-replace’ with string to replace from last > search string. Type C-M-% to run ‘query-replace-regexp’ with the last > search string. Type M-s o to run ‘occur’ that shows the last search > string. Type M-s h r to run ‘highlight-regexp’ that highlights the > last search string. > > Type C-h b to display all Isearch key bindings. Type C-h k to display > documentation of Isearch key. Type C-h m to display documentation of > Isearch mode.