js regular expression & email checker
const isValidEmail = (email = ``) => /^([w+.])+@(w+)([.]w+)+$/ig.test(email);
function isValidEmail(email = ``) {
return /^([w+.])+@(w+)([.]w+)+$/ig.test(email);
}
test
email = `wwW@com.xyz`;
"wwW@com.xyz"
/^([w+.])+@(w+)([.]w+)+$/ig.test(email)
true
email = `ww.W@com.xyz.abc`;
"ww.W@com.xyz.abc"
/^([w+.])+@(w+)([.]w+)+$/ig.test(email)
true
email = `ww.W@@com.xyz.abc`;
"ww.W@@com.xyz.abc"
/^([w+.])+@(w+)([.]w+)+$/ig.test(email)
false
email = `ww.W@com.xyz.abc..ufo`;
"ww.W@com.xyz.abc..ufo"
/^([w+.])+@(w+)([.]w+)+$/ig.test(email)
false
email = `ww.W@com.xyz.abc.nba.ufo`;
"ww.W@com.xyz.abc.nba.ufo"
/^([w+.])+@(w+)([.]w+)+$/ig.test(email)
true
Regular Expressions & Cheatsheet
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Character_Classes
w & W
基本的拉丁字母，包括下划线
w === [A-Za-z0-9_]
W === [^A-Za-z0-9_]
d & D
阿拉伯数字
d === [0-9]
D === [^0-9]
s & S
匹配单个空格字符，包括空格，制表符，换页符，换行符和其他Unicode空格。
s === [ f
vu00a0u1680u2000-u200au2028u2029u202fu205fu3000ufeff]
S === [^A-Za-z0-9_]
& B
边界字符检测
// 前，后
// 前，后
B
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Assertions
Group
分组
Range
范围
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Groups_and_Ranges
Quantifiers
量词
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Quantifiers
refs
Regular Expression
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Cheatsheet
https://www.nowcoder.com/ta/front-end
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