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Your algorithm looks to me like this: (defun bnry-srch (vctr itm strt end) "Searches for the item ITM in the vector VCTR. strt is usually 0 and end is vctr's length-1" (if (>= end strt) (let …

You're getting tripped up by the escaping requirements for Emacs regexps when expressed in the double-quoted read syntax for strings, in conjunction with some historical-compatibility behaviour in Ema …

... a way to search for and delete numerals above a certain value I think column-based solutions make more sense in this case but, just for fun, here's an interactive way you could delete numerals … above a certain value using search-and-replace: M-x replace-regexp RET \b\([0-9]\{6,\}\)\b RET \,(if (> \#1 164000) "" \1) RET Which will turn your example into: PSALMS 150 5 164000 Praise …

You can use M-x replace-regexp or M-x query-replace-regexp. e.g.: C-M-% throw \(".*?"\); RET throw new Error(\1); RET If "some message" might contain escaped double-quotes like "whoops, \"foo\" hap …

? is the zero-or-one quantifier: \\(...\\)? says the group may or may not match anything. Make it non-capturing if you don't care about backreferences to that group: \\(?:...\\)? I tried this bu …

You can, of course, search for: ^\*+ \(.\) aka "^\\*+ \\(.\\)" And then you'll have the character you wanted in the matched sub-group. It all depends on what you're doing, though. …

searches guarantee the longest match in any case, which is why we have C-hig (elisp)POSIX Regexps -- but those also don't behave any differently with respect to the backwards-search start-point issue, … and so using posix-search-backward doesn't change the outcome of your example at all. …

It sounds like you can search for [^(]) and then move point to the last position of that match. …

I struggled to parse that question, but I think you're asking for the regexp syntax which means "Any character -- even a newline character." You have tried using this: [.^J ] (where ^J here (and …

As with any search, (search-forward-regexp mylog-mode-error-regexp) produces match data which you can easily use to perform further processing on what the search found. … (while (and (search-forward-regexp mylog-mode-error-regexp) (save-excursion (save-restriction (narrow-to-region (match-beginning 0) (match-end 0)) …

For a vanilla Emacs approach, you might use: C-sM-c to initiate a case-sensitive search (assuming that you have isearch-case-fold-search enabled by default). … C-w to search/match the word at point (or whatever you need to do to isearch the thing you're looking at/for). M-% to enter the case-sensitive replacement for all matches. …

It looks like you ultimately want the characters between % and & in the buffer name? You might do this: (let ((s (buffer-name))) (string-match "%\\(.*?\\)&" s) (match-string 1 s))

Should I use a marker manually Yes, if you are repeatedly searching and replacing within the same initial beg end region, you need to use a marker to ensure that the bounds remain sane from one iter …

I can fake this via C-hv search-whitespace-regexp It wouldn't be a full solution unless your comment marker character could never occur in any other context (e.g. the string "100%"). … (progn (setq-local search-whitespace-regexp "\\([[:space:]\n]\\|%. …

Consider this question: Search and replace inside a rectangle in emacs That's what I want, except I'm not using CUA mode. … I'm confused by your question, because the bulk of the accepted answer to the question you have linked to is dedicated to achieving that very goal -- search and replace within a rectangle without using …