[英]Using a special email regular expression
I have some emails in the form: 我有一些电子邮件的形式:
staticN123@sub1.mydomain.com
staticN456@sub2.mydomain.com
staticN789@sub3-sub.mydomain.com
The dynamic is the number after the (N or M or F) character, and the subDomain between the @ and mydomain.com 动态值是(N,M或F)字符后的数字,以及@和mydomain.com之间的subDomain。
I want to make a regular expression that matches this form in a string, and if it's a match, get the number after the N character. 我想做一个正则表达式来匹配此形式的字符串,如果匹配,则获取N字符后的数字。
staticN([0-9]+)@.+\.mydomain\.com
instead of [0-9]+
you can also use \\d+
which is the same. 除了
[0-9]+
您还可以使用\\d+
。 the .+
after the @ could match too much. @之后的
.+
可能匹配过多。 eventually you'd like to replace that with [^\\.]+
to exclude sub.sub domains. 最终,您希望将其替换为
[^\\.]+
以排除sub.sub域。
update: 更新:
^staticN(\d+)@[a-z0-9_-]+\.mydomain\.com$
adding ^
and $
to match start and end of the search string to avoid false match to eg somthingwrong_staticN123@sub.mydomain.com.xyz 添加
^
和$
以匹配搜索字符串的开始和结尾 ,以避免与例如somthingwrong_staticN123@sub.mydomain.com.xyz的错误匹配
you can test this regexp here link to rubular 您可以在此处测试此正则表达式链接到rubular
-- -
applying changes discussed in comments below: 应用以下注释中讨论的更改:
^(?:.+<)?static[NMF](\d+)@[a-z0-9_-]+\.mydomain\.com>?$
code example to answer the question in one of the comments: 在注释之一中回答问题的代码示例:
// input
String str = "reply <staticN123@sub1.mydomain.com";
// example 1
String nr0 = str.replaceAll( "^(?:.+<)?static[NMF](\\d+)@[a-z0-9_-]+\\.mydomain\\.com>?$", "$1" );
System.out.println( nr0 );
// example 2 (precompile regex is faster if it's used more than once afterwards)
Pattern p = Pattern.compile( "^(?:.+<)?static[NMF](\\d+)@[a-z0-9_-]+\\.mydomain\\.com>?$" );
Matcher m = p.matcher( str );
boolean b = m.matches();
String nr1 = m.group( 1 ); // m.group only available after m.matches was called
System.out.println( nr1 );
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