expression regular which finds peer words on a file

proyecto
........\GestionArchivos
........\...............\build
........\...............\build.xml
........\...............\.....\classes
........\...............\.....\.......\gestionarchivos
........\...............\.....\.......\...............\GestionA.class
........\...............\.....\.......\...............\GestionArchivos.class
........\...............\.....\.......\...............\JFGArchivos$1.class
........\...............\.....\.......\...............\JFGArchivos.class
........\...............\.....\.......\...............\JFGestionA$1.class
........\...............\.....\.......\...............\JFGestionA$2.class
........\...............\.....\.......\...............\JFGestionA$3.class
........\...............\.....\.......\...............\JFGestionA.class
........\...............\.....\.......\...............\JFGestionA.form
........\...............\.....\.......\...............\JFGestionArchivos$1.class
........\...............\.....\.......\...............\JFGestionArchivos.class
........\...............\manifest.mf
........\...............\nbproject
........\...............\.........\build-impl.xml
........\...............\.........\genfiles.properties
........\...............\.........\private
........\...............\.........\.......\config.properties
........\...............\.........\.......\private.properties
........\...............\.........\.......\private.xml
........\...............\.........\project.properties
........\...............\.........\project.xml
........\...............\src
........\...............\...\gestionarchivos
........\...............\...\...............\GestionA.java
........\...............\...\...............\GestionArchivos.java
........\...............\...\...............\JFGestionA.form
........\...............\...\...............\JFGestionA.java
........\...............\test

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