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+====== Replace a string in a file with nant ======
+File content:
+<file cpp version.cpp>
+  #include "stdio.n"
+  #define VERSION "x.x.x.x"
+  void main() {
+  }
+</file>
+Create replace.build file to replace version with $BuildNumber:
+ <file xml replace.build>
+<version="1.0" encoding="utf-8" ?>
+<project name="replace.line" default="replace">
+  <target name="replace" descripton="replaces a line">
+<loadfile file="${version.file}" property="version.file.content" />
+  <regex
+      input="${version.file.content}"
+      pattern="(?'BEFORE'[\w\s\W]*)#define\sVERSION\s*&quot;[x][\.][x][\.][x][\.][x]&quot;(?'AFTER'[\w\s\W]*)" />
+   <echo
+      file="${version.file}"
+      message="${BEFORE}#define VERSION &quot;${BuildNumber}&quot;${AFTER}"
+      append="false" />
+</target>
+</project>
+ </file>
+Run it with:
+  nant -buildfile:replace.build -D:version.file=version.cpp -D:BuildNumber=9.1.0.1