diff --git a/mode/forth.py b/mode/forth.py
index 576c786..8ed7743 100644
--- a/mode/forth.py
+++ b/mode/forth.py
@@ -1,16 +1,25 @@
 from mode import Fundamental
 from lex import Grammar, PatternRule, RegionRule, NocasePatternRule, NocaseRegionRule
+from mode.python import StringGrammar2
 
 class DataGrammar(Grammar):
     rules = [PatternRule(r'data', r'[^)]+')]
 
+class StringGrammar1(Grammar):
+    rules = [PatternRule(r'data', r'[^\']+')]
+class StringGrammar3(Grammar):
+    rules = [PatternRule(r'data', r'[^)]+')]
+
 class ForthGrammar(Grammar):
     rules = [
         PatternRule(r'comment', r"\\.*$"),
         RegionRule(r'comment', r'\(', DataGrammar, r'\)'),
         NocaseRegionRule(r'comment', r'0 \[if\]', DataGrammar, r'\[(?:endif|then)\]'),
         PatternRule(r'delimiter', r"[:;\[\]]"),
-        NocasePatternRule(r'keyword', r'(?:variable|value|until|tuck|truth|to|then|test|swap|step|see|rot|roll|recurse|r>|pick|over|mod|m\*|loop|locals|invert|if|hex|here|fsort|fln|fexp|f!|f@|f\+|f-|f\*|f/|execute|endif|else|dup|drop|does>|do|decimal|d!|d@|create|constant|cells|cell|c!|c@|bye|begin|allot|\[(?:if|then|endif)\]|>r|!|@|\+loop|\+|-|\*/mod|\*/|\*|/mod|/)(?=[ \n])'),
+        RegionRule(r'string', r'[.cs]" ', StringGrammar1, r'"'),
+        RegionRule(r'string', r'[.s]\\" ', StringGrammar2, r'"'),
+        RegionRule(r'string', r'.\( ', StringGrammar3, r'\)'),
+        NocasePatternRule(r'keyword', r'(?:variable|value|until|tuck|truth|to|then|test|swap|step|see|rot|roll|recurse|r>|pick|over|mod|m\*|loop|locals|invert|if|hex|here|fsort|fln|fexp|f!|f@|f\+|f-|f\*|f/|execute|endif|else|dup|drop|does>|do|decimal|d!|d@|create|constant|cells|cell|c!|c@|bye|begin|allot|\[(?:if|then|endif)\]|>r|!|@|\+loop|\+|-|\*/mod|\*/|\*|/mod|/)(?=[ \n$])'),
         PatternRule(r'forth_def', r'(?<=:) +[^ ]+'),
         NocasePatternRule(r'number', r"'[a-z]"),
         NocasePatternRule(r'number', r'%?-?[0-1]+\.?'),
@@ -24,7 +33,7 @@ class ForthGrammar(Grammar):
 
 class Forth(Fundamental):
     modename   = 'FORTH'
-    extensions = ['.fs']
+    extensions = ['.fs', '.fi', '.fb']
     grammar    = ForthGrammar
     commentc   = '\\'
     colors     = {