fix: fix parse date string error e.g. '2020/9/30' (#980)

fix #979

Author: iamkun

src/constant.js

@@ -26,5 +26,5 @@ export const FORMAT_DEFAULT = 'YYYY-MM-DDTHH:mm:ssZ'
 export const INVALID_DATE_STRING = 'Invalid Date'
 
 // regex
-export const REGEX_PARSE = /^(\d{4})-?(\d{1,2})?-?(\d{0,2})[^0-9]*(\d{1,2})?:?(\d{1,2})?:?(\d{1,2})?.?(\d{1,3})?$/
+export const REGEX_PARSE = /^(\d{4})[-/]?(\d{1,2})?[-/]?(\d{0,2})[^0-9]*(\d{1,2})?:?(\d{1,2})?:?(\d{1,2})?.?(\d{1,3})?$/
 export const REGEX_FORMAT = /\[([^\]]+)]|Y{2,4}|M{1,4}|D{1,2}|d{1,4}|H{1,2}|h{1,2}|a|A|m{1,2}|s{1,2}|Z{1,2}|SSS/g

test/parse.test.js

@@ -1,6 +1,7 @@
 import moment from 'moment'
 import MockDate from 'mockdate'
 import dayjs from '../src'
+import { REGEX_PARSE } from '../src/constant'
 
 beforeEach(() => {
   MockDate.set(new Date())
@@ -125,3 +126,12 @@ it('Clone with same value', () => {
   const another = newBase.clone()
   expect(newBase.toString()).toBe(another.toString())
 })
+
+describe('REGEX_PARSE', () => {
+  it('2020/9/30', () => {
+    const date = '2020/9/30'
+    const d = date.match(REGEX_PARSE)
+    expect(dayjs(date).valueOf()).toBe(moment(date).valueOf())
+    expect(d.join('-')).toBe('2020/9/30-2020-9-30----')
+  })
+})