regex - Match one backlash; match two backslashes; match tilde + two backslashes -


i'm interested in seeing if possible match 1 backslash, , 2 backslashes, , tilde plus 2 backslashes. i'm using emacs in latex-mode , setting keywords font-lock. defining single backslash keyword wreaks havoc on variety of other definitions. i'd 1 backslash red; 2 backslashes blue; , tilde+two-back-slashes green. don't think tilde pose problem, i'd red itself. i've got font-lock-add-keywords format, not special regex type of situation. similar situation use \b before , after, won't work backslashes far know.

~ -- red

\ -- red, except when touching alphanumeric characters.

\\ -- blue

~\\ -- green

(defvar lawlist-face-a (make-face 'lawlist-face-a)) (set-face-attribute 'lawlist-face-a nil :foreground "red" :bold t)  (defvar lawlist-face-b (make-face 'lawlist-face-b)) (set-face-attribute 'lawlist-face-b nil :foreground "blue" :bold t)  (defvar lawlist-face-c (make-face 'lawlist-face-c)) (set-face-attribute 'lawlist-face-c nil :foreground "green" :bold t)  (font-lock-add-keywords 'latex-mode '(  ("~\\|\\\\" 0 lawlist-face-a prepend)  ("\\\\\\\\" 0 lawlist-face-b prepend)  ("~\\\\\\\\" 0 lawlist-face-c prepend)  ))

in context of example mentioned above, defining single backslash nullifies predefined warnings of font-latex.el within auctex-11.86 @ lines 280-285. removing "\\" fourth line of code doesn't remedy situation. typing \newpage, example, no longer associated font-latex-warning-face -- instead, comes undefined, assigned font-latex-sedate-face.

(defvar font-latex-built-in-keyword-classes   '(("warning"      ("nopagebreak" "pagebreak" "newpage" "clearpage" "cleardoublepage"       "enlargethispage" "nolinebreak" "linebreak" "newline" "-" "\\*" "\\"       "appendix" "displaybreak" "allowdisplaybreaks" "include")      'font-latex-warning-face 1 noarg)

buffer example -- latex-mode:

\newpage -- font face should font-latex-warning-face

\newpage -- font face erroneously appears font-latex-sedate-face when defining single backslash noted hereinabove.

edit -- troubleshooting -- testing -- screenshots of re-builder , latex document:

\\(\\\\\\)[^a-za-z@]

re-builder http://www.lawlist.com/images/re-builder_01.png

test01 http://www.lawlist.com/images/test01.png

(defvar lawlist-face-a (make-face 'lawlist-face-a)) (set-face-attribute 'lawlist-face-a nil :background "black" :foreground "red" :bold t)  (defvar lawlist-face-b (make-face 'lawlist-face-b)) (set-face-attribute 'lawlist-face-b nil :foreground "blue" :bold t)  (defvar lawlist-face-c (make-face 'lawlist-face-c)) (set-face-attribute 'lawlist-face-c nil :foreground "green" :bold t)  (font-lock-add-keywords 'latex-mode    '(("~\\|\\(\\\\\\)[^a-za-z@]" 0 lawlist-face-a prepend)      ("\\\\\\\\" 0 lawlist-face-b prepend)      ("~\\\\\\\\" 0 lawlist-face-c prepend)))

test02 http://www.lawlist.com/images/test02.png

latex commands can composed of letters (and @ symbol in libraries). therefore sufficient following distinguish between single slash , beginning of command:

(defvar lawlist-face-a (make-face 'lawlist-face-a)) (set-face-attribute 'lawlist-face-a nil :foreground "red" :bold t)  (defvar lawlist-face-b (make-face 'lawlist-face-b)) (set-face-attribute 'lawlist-face-b nil :foreground "blue" :bold t)  (defvar lawlist-face-c (make-face 'lawlist-face-c)) (set-face-attribute 'lawlist-face-c nil :foreground "green" :bold t)  (font-lock-add-keywords 'latex-mode                         '(("~" 0 lawlist-face-a prepend)                           ("\\(\\\\\\)[^a-za-z@]" 1 lawlist-face-a prepend)                           ("\\\\\\\\" 0 lawlist-face-b prepend)                           ("~\\\\\\\\" 0 lawlist-face-c prepend)))

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