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Created attachment 97950 [details] A screen image showing the Illegal Argument Exception in action. Build ID: 200802251018 Steps To Reproduce: 1. In CDT, create a new 'C' project with any target which uses the internal builder. I selected MinGW as the target and called the project "MinGWproject". 2. Add a new file to the project containing a dollar. I called mine "file$name.c". 3. Type a dummy "main" into the file and build it. You should then see the following message in the console window: **** Rebuild of configuration Debug for project MinGWproject **** **** Internal Builder is used for build **** Build error Illegal group reference More information: The problem occurs because "resolvePercent" in the file "BuildDescription.class" in "org.eclipse.cdt.managedbuilder.internal.buildmodel.builddescription" calls "replaceAll" with the file name as the second parameter. java.lang.String.replaceAll help says: Note that backslashes (\) and dollar signs ($) in the replacement string may cause the results to be different than if it were being treated as a literal replacement string; see Matcher.replaceAll. Use Matcher.quoteReplacement(java.lang.String) to suppress the special meaning of these characters, if desired. Suggested fix: use Matcher.quoteReplacement instead of replaceAll.
