diff --git a/nbconvert/filters/ansi.py b/nbconvert/filters/ansi.py
index 722f573..8461e09 100644
--- a/nbconvert/filters/ansi.py
+++ b/nbconvert/filters/ansi.py
@@ -95,3 +95,44 @@ def ansi2html(text):
     if opened:
         text += '</span>'
     return text
+
+
+def single_ansi2latex(code):
+    """Converts single ansi markup to latex format
+
+    Return latex code and number of open brackets.
+    """
+    for color in coloransi.color_templates:
+        colcode = getattr(coloransi.TermColors,color[0])
+        # regular fonts
+        if code == colcode:
+            return '\\'+color[0].lower()+'{', 1
+        # bold fonts
+        if code == colcode[:3]+str(1)+colcode[3:]:
+            return '\\textbf{\\textcolor{'+color[0].lower()+'}{', 2
+    return '', 0
+
+def ansi2latex(text):
+    """Converts ansi formated text to latex version
+
+    based on https://bitbucket.org/birkenfeld/sphinx-contrib/ansi.py
+    """
+    color_pattern = re.compile('\x1b\\[([^m]+)m')
+    last_end = 0
+    openbrack = 0
+    outstring = ''
+    for match in color_pattern.finditer(text):
+        head = text[last_end:match.start()]
+        formater = match.group()
+        outstring += head
+        if openbrack:
+            outstring += '}'*openbrack
+            openbrack = 0
+        if match.group() <> coloransi.TermColors.Normal and not openbrack:
+            texform, openbrack = single_ansi2latex(match.group())
+            outstring += texform
+        last_end = match.end()
+    if openbrack: 
+        outstring += '}'*openbrack
+    outstring += text[last_end:]
+    return outstring.strip()
diff --git a/nbconvert/filters/strings.py b/nbconvert/filters/strings.py
index b27b2ad..d42a7ad 100755
--- a/nbconvert/filters/strings.py
+++ b/nbconvert/filters/strings.py
@@ -54,52 +54,6 @@ def strip_dollars(text):
 
     return text.strip('$')
 
-def add_ansi_attr(ansistr, attr):
-    """Adds the attribute key to the ansi colors defined
-    with IPython.utils.ansicolors. Allows to boldface
-    the dark characters.
-    """
-    return ansistr[:3]+str(attr)+ansistr[3:]
-
-def single_ansi2latex(code):
-    """Converts single ansi markup to latex format
-
-    Return latex code and number of open brackets.
-    """
-    for color in coloransi.color_templates:
-        colcode = getattr(coloransi.TermColors,color[0])
-        # regular fonts
-        if code == colcode:
-            return '\\'+color[0].lower()+'{', 1
-        # bold fonts
-        if code == add_ansi_attr(colcode,1):
-            return '\\textbf{\\textcolor{'+color[0].lower()+'}{', 2
-    return '', 0
-
-def ansi2latex(text):
-    """Converts ansi formated text to latex version
-
-    based on https://bitbucket.org/birkenfeld/sphinx-contrib/ansi.py
-    """
-    color_pattern = re.compile('\x1b\\[([^m]+)m')
-    last_end = 0
-    openbrack = 0
-    outstring = ''
-    for match in color_pattern.finditer(text):
-        head = text[last_end:match.start()]
-        formater = match.group()
-        outstring += head
-        if openbrack:
-            outstring += '}'*openbrack
-            openbrack = 0
-        if match.group() <> coloransi.TermColors.Normal and not openbrack:
-            texform, openbrack = single_ansi2latex(match.group())
-            outstring += texform
-        last_end = match.end()
-    if openbrack: 
-        outstring += '}'*openbrack
-    outstring += text[last_end:]
-    return outstring.strip()
 
 def rm_fake(text):
     """