如何修改JavaScript正则表达式以正确提取名称/邮箱与日期信息？

输入示例 #

input1 = 'firstName.lastName@email.com - Fri, 19 May 2023 10:13:23 GMT Test Task from firstName.lastName@email.com'
input2 = 'firstNamelastName@email.com - Fri, 19 May 2023 10:13:23 GMT Test Task from firstNamelastName@email.com'
input3 = 'someName - Fri, 19 May 2023 10:13:23 GMT Test Task from someName'

期望输出 #

output1 = firstName.lastName@email.com - Fri, 19 May 2023 10:13:23 GMT
output2 = firstName@email.com - Fri, 19 May 2023 10:13:23 GMT
output3 = someName - Fri, 19 May 2023 10:13:23 GMT

问题场景 #

尝试使用以下正则提取内容：

regularEx = /\w+\.[a-zA-Z]+\s-\s\w{3},\s\d{1,2}\s[a-zA-Z]{3,9}\s\d{4}\s\d{1,2}:\d{1,2}:\d{1,2}\s[a-zA-Z]{3}/g

myInput = 'firstName.lastName@email.com - Fri, 19 May 2023 10:13:23 GMT Test Task from firstName.lastName@email.com'

regularEx.exec(myInput);

得到错误输出：

[
    "com - Fri, 19 May 2023 10:13:23 GMT"
]

需要修改正则以获取预期的完整匹配结果。

解决方案 #

原正则开头的\w+\.[a-zA-Z]+仅能匹配类似xxx.com的片段，无法覆盖带@的邮箱或纯名称的场景，导致只捕获到了末尾的部分内容。

修改后的正则表达式 #

推荐两种方案：

• 精准匹配方案：针对开头的标识（邮箱/纯名称），使用[\w@.]+匹配包含字母、数字、@、.的内容：

const regularEx = /[\w@.]+\s-\s\w{3},\s\d{1,2}\s[a-zA-Z]{3,9}\s\d{4}\s\d{1,2}:\d{1,2}:\d{1,2}\s[a-zA-Z]{3}/;

• 通用匹配方案：使用非贪婪模式匹配到-及后续时间部分结束，兼容性更强：

const regularEx = /.*?\s-\s\w{3},\s\d{1,2}\s[a-zA-Z]{3,9}\s\d{4}\s\d{2}:\d{2}:\d{2}\s[a-zA-Z]{3}/;

验证代码 #

// 使用精准匹配方案测试
const regularEx = /[\w@.]+\s-\s\w{3},\s\d{1,2}\s[a-zA-Z]{3,9}\s\d{4}\s\d{1,2}:\d{1,2}:\d{1,2}\s[a-zA-Z]{3}/;

const input1 = 'firstName.lastName@email.com - Fri, 19 May 2023 10:13:23 GMT Test Task from firstName.lastName@email.com';
console.log(regularEx.exec(input1)[0]); // 输出：firstName.lastName@email.com - Fri, 19 May 2023 10:13:23 GMT

const input2 = 'firstNamelastName@email.com - Fri, 19 May 2023 10:13:23 GMT Test Task from firstNamelastName@email.com';
console.log(regularEx.exec(input2)[0]); // 输出：firstNamelastName@email.com - Fri, 19 May 2023 10:13:23 GMT

const input3 = 'someName - Fri, 19 May 2023 10:13:23 GMT Test Task from someName';
console.log(regularEx.exec(input3)[0]); // 输出：someName - Fri, 19 May 2023 10:13:23 GMT

内容的提问来源于stack exchange，提问作者Aditya Kumar