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   On *nix:
...
   On Windows (I think):
    perl -pi -e "s{\b((?:[a-zA-Z0-9]+_)+[a-zA-Z0-9]+\(\)\b}{<a href=\"
+$1.html\">$1()</a>}g" *

    s{                              # match and replace on $_
      \b                            # start with a word boundary
...
       <a href="$1.html">$1()</a>   # replace the matched text with th
+is string
     }                              # substituting the value of $1 (th
+e first capture)
     g                              # perform this replace on all matc
+hes in $_

    abc
    abc()
...
    <a href="abc_def_ghi.html">abc_def_ghi()</a>
    <a href="abc_def_ghi.html">abc_def_ghi()</a>()