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(emacs)Unconditional Replace

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Unconditional Replacement
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`M-x replace-string <RET> STRING <RET> NEWSTRING <RET>'
     Replace every occurrence of STRING with NEWSTRING.

`M-x replace-regexp <RET> REGEXP <RET> NEWSTRING <RET>'
     Replace every match for REGEXP with NEWSTRING.

   To replace every instance of `foo' after point with `bar', use the
command `M-x replace-string' with the two arguments `foo' and `bar'.
Replacement happens only in the text after point, so if you want to
cover the whole buffer you must go to the beginning first.  All
occurrences up to the end of the buffer are replaced; to limit
replacement to part of the buffer, narrow to that part of the buffer
before doing the replacement (Note: Narrowing).  In Transient Mark
mode, when the region is active, replacement is limited to the region
(Note: Transient Mark).

   When `replace-string' exits, it leaves point at the last occurrence
replaced.  It sets the mark to the prior position of point (where the
`replace-string' command was issued); use `C-u C-<SPC>' to move back
there.

   A numeric argument restricts replacement to matches that are
surrounded by word boundaries.  The argument's value doesn't matter.