diff --git a/docs/source/doc/kaleidoscope/PythonLangImpl1.rst b/docs/source/doc/kaleidoscope/PythonLangImpl1.rst
index 90943c1..00b16fb 100644
--- a/docs/source/doc/kaleidoscope/PythonLangImpl1.rst
+++ b/docs/source/doc/kaleidoscope/PythonLangImpl1.rst
@@ -226,7 +226,7 @@ the line.
    
    # Regular expressions that tokens and comments of our language.
    REGEX_NUMBER = re.compile('[0-9]+(?:.[0-9]+)?')
-   REGEX_IDENTIFIER = re.compile('[a-zA-Z][a-zA-Z0-9]\ *')
+   REGEX_IDENTIFIER = re.compile('[a-zA-Z][a-zA-Z0-9]*')
    REGEX_COMMENT = re.compile('#.*')
    
 
diff --git a/docs/source/doc/kaleidoscope/PythonLangImpl2.rst b/docs/source/doc/kaleidoscope/PythonLangImpl2.rst
index d5d6efc..a375512 100644
--- a/docs/source/doc/kaleidoscope/PythonLangImpl2.rst
+++ b/docs/source/doc/kaleidoscope/PythonLangImpl2.rst
@@ -772,7 +772,7 @@ Lexer
    
    # Regular expressions that tokens and comments of our language.
    REGEX_NUMBER = re.compile('[0-9]+(?:\.[0-9]+)?') 
-   REGEX_IDENTIFIER = re.compile('[a-zA-Z][a-zA-Z0-9] *') 
+   REGEX_IDENTIFIER = re.compile('[a-zA-Z][a-zA-Z0-9]*')
    REGEX_COMMENT = re.compile('#.*')
    
    def Tokenize(string): 
diff --git a/docs/source/doc/kaleidoscope/PythonLangImpl6.rst b/docs/source/doc/kaleidoscope/PythonLangImpl6.rst
index 2e98cef..8ff31d4 100644
--- a/docs/source/doc/kaleidoscope/PythonLangImpl6.rst
+++ b/docs/source/doc/kaleidoscope/PythonLangImpl6.rst
@@ -847,7 +847,7 @@ Lexer
    
    # Regular expressions that tokens and comments of our language.
    REGEX_NUMBER = re.compile('[0-9]+(?:\.[0-9]+)?') 
-   REGEX_IDENTIFIER = re.compile('[a-zA-Z][a-zA-Z0-9] *') 
+   REGEX_IDENTIFIER = re.compile('[a-zA-Z][a-zA-Z0-9]*')
    REGEX_COMMENT = re.compile('#.*')
    
    def Tokenize(string): 
diff --git a/docs/source/doc/kaleidoscope/PythonLangImpl7.rst b/docs/source/doc/kaleidoscope/PythonLangImpl7.rst
index d3dfb74..629608c 100644
--- a/docs/source/doc/kaleidoscope/PythonLangImpl7.rst
+++ b/docs/source/doc/kaleidoscope/PythonLangImpl7.rst
@@ -1000,7 +1000,7 @@ Lexer
    
    # Regular expressions that tokens and comments of our language.
    REGEX_NUMBER = re.compile('[0-9]+(?:\.[0-9]+)?') 
-   REGEX_IDENTIFIER = re.compile('[a-zA-Z][a-zA-Z0-9] *') 
+   REGEX_IDENTIFIER = re.compile('[a-zA-Z][a-zA-Z0-9] *')
    REGEX_COMMENT = re.compile('#.*')
    
    def Tokenize(string):