eighth week(2)

Regular Expression 使用规则

1、正则表达式通常被用来检索、替换那些符合某个模式(规则)的文本。

2、给定一个正则表达式和另一个字符串,可以达到如下目的：

（1）给定的字符串是否符合正则表达式的过滤逻辑（称作“匹配”）；

（2）可以通过正则表达式，从字符串中获取我们想要的特定部分。

3、正则表达式"testing"中没有包含任何元字符，它可以匹配"testing"和"testing123"等字符串，但是不能匹配"Testing"。

4、正则表达式是区分大小写的，如果要忽略大小写可使用方括号表达式“[]”。只要匹配的字符出现在方括号内，即可表示匹配成功。但要注意：一个方括号只能匹配一个字符。例如，要匹配的字串tm不区分大小写，那么该表达式应该写作如下格式：[Tt][Mm].

用正则表达式写出查找姓名，电话，邮件的表达式
name: var str = "My name is Linda";
var n = str.search(/Linda/i);

phone: var str= "My phone is 15152180476";
var n =str .search(/15152180476/i);

email: var str= "My email is 1964728520@qq.com";
var n =str .search(/1964728520@qq.com/i);

转载于:https://www.cnblogs.com/l69-l54/p/9846595.html

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