From 14ee9e74bf68024fcb53c305b1f15c6aab6e89d3 Mon Sep 17 00:00:00 2001
From: Liwei Qian <sliwey@users.noreply.github.com>
Date: Wed, 6 Sep 2017 03:48:43 +0800
Subject: [PATCH] perf: optimize the performance of hyphenate method. (#6274)

---
 src/shared/util.js | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/src/shared/util.js b/src/shared/util.js
index 4cf81eeb389..709fe146403 100644
--- a/src/shared/util.js
+++ b/src/shared/util.js
@@ -157,12 +157,9 @@ export const capitalize = cached((str: string): string => {
 /**
  * Hyphenate a camelCase string.
  */
-const hyphenateRE = /([^-])([A-Z])/g
+const hyphenateRE = /\B([A-Z])/g
 export const hyphenate = cached((str: string): string => {
-  return str
-    .replace(hyphenateRE, '$1-$2')
-    .replace(hyphenateRE, '$1-$2')
-    .toLowerCase()
+  return str.replace(hyphenateRE, '-$1').toLowerCase()
 })
 
 /**