tools/types/register.jam regexp review (#501)

Author: paolopas

src/tools/types/register.jam

@@ -23,7 +23,7 @@ local rule type ( type : suffixes * : base-type ? : os * )
 .this-module's-file = [ modules.binding $(__name__) ] ;
 .this-module's-dir = [ path.parent [ path.make $(.this-module's-file) ] ] ;
 .sibling-jamfiles =  [ path.glob $(.this-module's-dir) : *.jam ] ;
-.sibling-modules = [ MATCH ^(.*)\.jam$ : $(.sibling-jamfiles) ] ;
+.sibling-modules = [ MATCH ^(.*)\\.jam$ : $(.sibling-jamfiles) ] ;
 
 # A loop over all modules in this directory
 for m in $(.sibling-modules)