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See Regexp Backslash in The GNU Emacs Manual.
or operator is ‘\|’, not ‘|’, and the grouping operators
are ‘\(’ and ‘\)’. Also, the string syntax for a backslash is
‘\\’. To specify a regular expression like ‘xxx\(foo\|bar\)’
in a Lisp string, use ‘xxx\\(foo\\|bar\\)’.
Note the doubled backslashes!