Regexp Replacement
The M-x replace-string command replaces exact matches for a
single string. The similar command M-x replace-regexp replaces
any match for a specified pattern.
In replace-regexp, the newstring need not be constant: it
can refer to all or part of what is matched by the regexp.
\& in newstring stands for the entire match being replaced.
\d in newstring, where d is a digit, stands for
whatever matched the dth parenthesized grouping in regexp.
To include a \ in the text to replace with, you must enter
\\. For example,
M-x replace-regexp <RET> c[ad]+r <RET> \&-safe <RET>
replaces (for example) cadr with cadr-safe and cddr
with cddr-safe.
M-x replace-regexp <RET> \(c[ad]+r\)-safe <RET> \1 <RET>
performs the inverse transformation.
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