From 84d34ad376e425a85b546227a48a16af24924137 Mon Sep 17 00:00:00 2001
From: "jie.wang" <38901892+jievince@users.noreply.github.com>
Date: Tue, 12 Apr 2022 16:24:45 +0800
Subject: [PATCH] fix the wrong regex pattern of scientific notation (#4136)

---
 src/parser/scanner.lex          | 5 ++---
 src/parser/test/ScannerTest.cpp | 3 +++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/parser/scanner.lex b/src/parser/scanner.lex
index 7650feab8f5..b0e13b4b978 100644
--- a/src/parser/scanner.lex
+++ b/src/parser/scanner.lex
@@ -402,9 +402,8 @@ LABEL_FULL_WIDTH            {CN_EN_FULL_WIDTH}{CN_EN_NUM_FULL_WIDTH}*
                                 return parseDecimal();
                             }
 
-{DEC}*\.{DEC}+              |
-{DEC}+\.{DEC}*              |
-{DEC}*\.{DEC}*{EXP}         |
+{DEC}*\.{DEC}+{EXP}?        |
+{DEC}+\.{DEC}*{EXP}?        |
 {DEC}+{EXP}                 {
                                 return parseDouble();
                             }
diff --git a/src/parser/test/ScannerTest.cpp b/src/parser/test/ScannerTest.cpp
index a9d612f09fe..bd05a318dd3 100644
--- a/src/parser/test/ScannerTest.cpp
+++ b/src/parser/test/ScannerTest.cpp
@@ -540,6 +540,9 @@ TEST(Scanner, Basic) {
       CHECK_SEMANTIC_VALUE("123.", TokenType::DOUBLE, 123.),
       CHECK_SEMANTIC_VALUE(".123", TokenType::DOUBLE, 0.123),
       CHECK_SEMANTIC_VALUE("123.456", TokenType::DOUBLE, 123.456),
+      CHECK_SEMANTIC_VALUE("1.2e1", TokenType::DOUBLE, 12.0),
+      CHECK_SEMANTIC_VALUE("1.e2", TokenType::DOUBLE, 100.0),
+      CHECK_SEMANTIC_VALUE(".2e3", TokenType::DOUBLE, 200.0),
 
       CHECK_SEMANTIC_VALUE("0x7FFFFFFFFFFFFFFF", TokenType::INTEGER, 0x7FFFFFFFFFFFFFFFL),
       CHECK_SEMANTIC_VALUE("0x007FFFFFFFFFFFFFFF", TokenType::INTEGER, 0x007FFFFFFFFFFFFFFFL),