diff --git a/misc/factor.vim.fgen b/misc/factor.vim.fgen
index fbbb1a79fb..ff53e8129f 100644
--- a/misc/factor.vim.fgen
+++ b/misc/factor.vim.fgen
@@ -82,7 +82,7 @@ syn cluster factorReal          contains=factorInt,factorFloat,factorPosRatio,fa
 syn cluster factorNumber        contains=@factorReal,factorComplex
 syn cluster factorNumErr        contains=factorBinErr,factorHexErr,factorOctErr
 syn match   factorInt           /\<-\=[0-9]\([0-9,]*[0-9]\)\?\([eE]\([+-]\)\?[0-9]\+\)\?\>/
-syn match   factorFloat         /\<-\=[0-9]\([0-9,]*[0-9]\)\?\(\.\(\([0-9,]*[0-9]\+\)\?\([eE]\([+-]\)\?[0-9]\+\)\?\)\?\)\?\>/
+syn match   factorFloat         /\<-\=\([0-9,]*[0-9]\)\?\(\.\(\([0-9,]*[0-9]\+\)\?\([eE]\([+-]\)\?[0-9]\+\)\?\)\?\)\?\>/
 syn match   factorPosRatio      /\<+\=[0-9]\([0-9,]*[0-9]\)\?\(+[0-9]\([0-9,]*[0-9]\+\)\?\)\?\/-\=[0-9]\([0-9,]*[0-9]\+\)\?\.\?\>/
 syn match   factorNegRatio      /\<\-[0-9]\([0-9,]*[0-9]\)\?\(\-[0-9]\([0-9,]*[0-9]\+\)\?\)\?\/-\=[0-9]\([0-9,]*[0-9]\+\)\?\.\?\>/
 syn region  factorComplex       start=/\<C{\>/ end=/\<}\>/ contains=@factorReal
diff --git a/misc/vim/syntax/factor.vim b/misc/vim/syntax/factor.vim
index 4c7074e977..ed0d7b5719 100644
--- a/misc/vim/syntax/factor.vim
+++ b/misc/vim/syntax/factor.vim
@@ -70,7 +70,7 @@ syn cluster factorReal          contains=factorInt,factorFloat,factorPosRatio,fa
 syn cluster factorNumber        contains=@factorReal,factorComplex
 syn cluster factorNumErr        contains=factorBinErr,factorHexErr,factorOctErr
 syn match   factorInt           /\<-\=[0-9]\([0-9,]*[0-9]\)\?\([eE]\([+-]\)\?[0-9]\+\)\?\>/
-syn match   factorFloat         /\<-\=[0-9]\([0-9,]*[0-9]\)\?\(\.\(\([0-9,]*[0-9]\+\)\?\([eE]\([+-]\)\?[0-9]\+\)\?\)\?\)\?\>/
+syn match   factorFloat         /\<-\=\([0-9,]*[0-9]\)\?\(\.\(\([0-9,]*[0-9]\+\)\?\([eE]\([+-]\)\?[0-9]\+\)\?\)\?\)\?\>/
 syn match   factorPosRatio      /\<+\=[0-9]\([0-9,]*[0-9]\)\?\(+[0-9]\([0-9,]*[0-9]\+\)\?\)\?\/-\=[0-9]\([0-9,]*[0-9]\+\)\?\.\?\>/
 syn match   factorNegRatio      /\<\-[0-9]\([0-9,]*[0-9]\)\?\(\-[0-9]\([0-9,]*[0-9]\+\)\?\)\?\/-\=[0-9]\([0-9,]*[0-9]\+\)\?\.\?\>/
 syn region  factorComplex       start=/\<C{\>/ end=/\<}\>/ contains=@factorReal