Regular Expressions 101

Community Patterns

校验登录名

0

Regular Expression
ECMAScript (JavaScript)

/
^[a-zA-Z]{1}([a-zA-Z0-9]|[._]){4,19}$
/

Description

只能输入5-20个以字母开头、可带数字、“_”、“.”的字串

Submitted by anonymous - 6 years ago