diff --git a/sqlparse/keywords.py b/sqlparse/keywords.py
index dd6e5d15..82fa56d3 100644
--- a/sqlparse/keywords.py
+++ b/sqlparse/keywords.py
@@ -159,7 +159,7 @@ def find_delimited_spans(text):
     (r'(?<=\.)[A-ZÀ-Ü]\w*', tokens.Name),  # .'Name'
     (r'[A-ZÀ-Ü]\w*(?=\()', tokens.Name),  # side effect: change kw to func
     (r'-?0x[\dA-F]+', tokens.Number.Hexadecimal),
-    (r'-?\d+(\.\d+)?E-?\d+', tokens.Number.Float),
+    (r'-?\d+(\.\d+)?E[+-]?\d+', tokens.Number.Float),
     (r'(?![_A-ZÀ-Ü])-?(\d+(\.\d*)|\.\d+)(?![_A-ZÀ-Ü])',
      tokens.Number.Float),
     (r'(?![_A-ZÀ-Ü])-?\d+(?![_A-ZÀ-Ü])', tokens.Number.Integer),
diff --git a/tests/test_format.py b/tests/test_format.py
index 93495067..0fa5b94c 100644
--- a/tests/test_format.py
+++ b/tests/test_format.py
@@ -351,6 +351,10 @@ class TestSpacesAroundOperators:
     def formatter(sql):
         return sqlparse.format(sql, use_space_around_operators=True)
 
+    @pytest.mark.parametrize('number', ['1e+3', '1E+3', '1.25e+3', '-1.25E+3'])
+    def test_preserves_positive_exponents(self, number):
+        assert self.formatter(f'SELECT {number}*2') == f'SELECT {number} * 2'
+
     def test_basic(self):
         sql = ('select a+b as d from table '
                'where (c-d)%2= 1 and e> 3.0/4 and z^2 <100')
diff --git a/tests/test_parse.py b/tests/test_parse.py
index 67168410..e7d140d3 100644
--- a/tests/test_parse.py
+++ b/tests/test_parse.py
@@ -213,6 +213,10 @@ def test_placeholder(ph):
     ('6.67428E-8', T.Number.Float),
     ('1.988e33', T.Number.Float),
     ('1e-12', T.Number.Float),
+    ('1e+3', T.Number.Float),
+    ('1E+3', T.Number.Float),
+    ('1.25e+3', T.Number.Float),
+    ('-1.25E+3', T.Number.Float),
     ('e1', None),
 ])
 def test_scientific_numbers(num, expected):