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elisp

Use `replace-regexp` in program rather in interative mdoe

I tried 

ELISP> (replace-regexp "war" "negotiation" "trade war")
nil
ELISP>

The results I expect is "trade negotiation"

How could use regex in elisp program?

Solution

  • I think you mistakenly used replace-regex instead of replace-regexp-in-string:

    ELISP> (replace-regexp-in-string "war" "negotiation" "trade war")
"trade negotiation"

    replace-regexp's third argument is:

    Third arg DELIMITED (prefix arg if interactive), if non-nil, means replace only matches surrounded by word boundaries. A negative prefix arg means replace backward.