diff --git a/include/boost/lexical_cast.hpp b/include/boost/lexical_cast.hpp
index d9b73af..044354f 100644
--- a/include/boost/lexical_cast.hpp
+++ b/include/boost/lexical_cast.hpp
@@ -798,12 +798,8 @@ namespace boost
                 if (begin == end) return false;
             }
 
-            if ( *begin < czero || *begin >= czero + 10 ) {
-                return false;
-            }
-
-
             bool found_decimal = false;
+            bool found_number_before_exp = false;
             int pow_of_10 = 0;
             mantissa_type mantissa=0;
             bool is_mantissa_full = false;
@@ -830,6 +826,8 @@ namespace boost
                     -- pow_of_10;
                     mantissa = tmp_mantissa;
                     mantissa += *begin - zero;
+
+                    found_number_before_exp = true;
                 } else {
 
                     if (*begin >= czero && *begin < czero + 10) {
@@ -851,6 +849,7 @@ namespace boost
                             ++ pow_of_10;
                         }
 
+                        found_number_before_exp = true;
                         ++ length_since_last_delim;
                     } else if ( *begin == decimal_point || *begin == lowercase_e || *begin == capital_e) {
 #ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
@@ -874,7 +873,10 @@ namespace boost
                             ++ begin;
                             found_decimal = true;
                             continue;
-                        }else break;
+                        }else {
+                            if (!found_number_before_exp) return false;
+                            break;
+                        }
                     }
 #ifndef BOOST_LEXICAL_CAST_ASSUME_C_LOCALE
                     else if (grouping_size && *begin == thousands_sep){
diff --git a/lexical_cast.htm b/lexical_cast.htm
index 7a1fee5..2079a0f 100644
--- a/lexical_cast.htm
+++ b/lexical_cast.htm
@@ -331,7 +331,7 @@ This table shows the execution time in milliseconds for 100000 calls of the foll
     <tr><td>string->int</td><td bgcolor="#00C000">7</td><td>115</td><td>23</td><td>18</td></tr>
     <tr><td>string->unsigned int</td><td bgcolor="#00C000">7</td><td>117</td><td>22</td><td>17</td></tr>
     <tr><td>string->bool</td><td bgcolor="#00C000"><1</td><td>104</td><td>19</td><td>10</td></tr>
-    <tr><td>string->float</td><td>85</td><td>172</td><td>60</td><td bgcolor="#00C000">33</td></tr>
+    <tr><td>string->float</td><td bgcolor="#00C000">13</td><td>172</td><td>60</td><td>33</td></tr>
     <tr><td>char->string</td><td bgcolor="#00C000">7</td><td>105</td><td>16</td><td>12</td></tr>
     <tr><td>int->string</td><td bgcolor="#00C000">15</td><td>131</td><td>21</td><td>17</td></tr>
     <tr><td>unsigned int->string</td><td bgcolor="#00C000">14</td><td>125</td><td>21</td><td>17</td></tr>
diff --git a/test/lexical_cast_float_types_test.cpp b/test/lexical_cast_float_types_test.cpp
index 442ed3b..66f6d67 100755
--- a/test/lexical_cast_float_types_test.cpp
+++ b/test/lexical_cast_float_types_test.cpp
@@ -194,7 +194,9 @@ void test_converion_to_float_types()
     CHECK_CLOSE_ABS_DIFF(0.0E-1, test_t);
     CHECK_CLOSE_ABS_DIFF(-1.0E-1, test_t);
 
-
+    CHECK_CLOSE_ABS_DIFF(.0E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(.0E-1, test_t);
+    CHECK_CLOSE_ABS_DIFF(-.0E-1, test_t);
 
     CHECK_CLOSE_ABS_DIFF(10.0, test_t);
     CHECK_CLOSE_ABS_DIFF(00.0, test_t);
@@ -235,6 +237,10 @@ void test_converion_to_float_types()
     CHECK_CLOSE_ABS_DIFF(-10101.0E-011, test_t);
     CHECK_CLOSE_ABS_DIFF(-10101093, test_t);
     CHECK_CLOSE_ABS_DIFF(10101093, test_t);
+    
+    CHECK_CLOSE_ABS_DIFF(-.34, test_t);
+    CHECK_CLOSE_ABS_DIFF(.34, test_t);
+    CHECK_CLOSE_ABS_DIFF(.34e10, test_t);
 
 //    BOOST_CHECK(lexical_cast<test_t>("-inf") == -std::numeric_limits<test_t>::infinity() );
 //    BOOST_CHECK(lexical_cast<test_t>("-INF") == -std::numeric_limits<test_t>::infinity() );