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The manual says to use '\|', as in a\|b matches a or b. But when I use it with regexp builder or align-regexp e.g. with, "True\|False", it doesn't recognize "True" or "False". I get the following message:
Wrong argument type: integer-or-marker-p, nil
What am I doing wrong?
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Special Regex Characters: These characters have special meaning in regex (to be discussed below): . , + , * , ? , ^ , $ , ( , ) , [ , ] , { , } , | , \ . Escape Sequences (\char): To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ).
"\n" matches a newline character.
\\|
A Few Additional Notes:
Emacs has 2 escaping styles, one in EmacsLisp the other when used in commands,
ie. from the M-x prompt (rgrep, occur, …)
In EmacsLisp, use the double backslash
\\|
…
From
M-x …use a single backslash\|
… As a side note, when writing embedded EmacsLisp, for example in yasnippet dynamic expansions, you have to use a quadruple backslash: \\\\| (to escape the double backslashes.)
Always avoid this (if possible), for example in yasnippet you can provide mode related emacslisp, without the additional escaping, via a .yas-setup.el
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