调用re库，通过使用compile、findall获取字符串中的email

import re
email=re.compile(r'[a-z0-9\-\.]+@[0-9a-z\-\.]+')
emailtest=r'adfasldfjdsl fan02@163.com'
emailset=set()
for em in email.findall(emailtest):
  emailset.add(em)
for em1 in sorted(emailset):
  print(em1)

修改：

通过调用函数，并动态地为字符串赋值

import re
def emailre(teststr):
  email=re.compile(r'[a-z0-9\-\.]+@[0-9a-z\-\.]+')
  emailset=set() #列表
  for em in email.findall(teststr):
    emailset.add(em)
  for eml in sorted(emailset):
    print(eml)
emailtest='sdfdsgf asd03@162.com'
emailre(emailtest)
#或
strtest=r'sdgfsg abc@163.com'
emailre(strtest)

运行结果：

补充：

从指定的字符串中提取Email：

 /**
 * 从指定的字符串中提取Email
 * content 指定的字符串
 */
 public static String parse(String content) {
 String email = null;
 if (content==null || content.length()<1) {
return email;
 }
//找出含有@
int beginPos;
int i;
String token = "@";
String preHalf="";
String sufHalf = "";

beginPos = content.indexOf(token);
if (beginPos>-1) {
//前项扫描
String s = null;
 i= beginPos;
while(i>0) {
s = content.substring(i-1,i);
if (isLetter(s))
  preHalf = s+preHalf;
 else
  break;
 i--;
 }
//后项扫描
 i= beginPos+1;
 while( i<content.length()) {
 s = content.substring(i,i+1);
 if (isLetter(s))
  sufHalf = sufHalf +s;
 else
  break;
  i++; 
 }
 //判断合法性
 email = preHalf + "@" + sufHalf;
 if (isEmail(email)) {
 return email;
}
 }
return null;
}

/**
* 判断是不是合法Email
* email Email地址
*/
public static boolean isEmail(String email) {
try {
 if (email==null || email.length()<1 || email.length()>256) {
 return false;
}
 
String check = "^([0-9a-zA-Z]+[_.0-9a-zA-Z-]+)@([a-zA-Z0-9-]+[.])+([a-zA-Z]{2,3})$";
Pattern regex = Pattern.compile(check);
Matcher matcher = regex.matcher(email);
 boolean isMatched = matcher.matches();
if(isMatched) {
 return true;
} else {
 return false;
}
} catch (RuntimeException e) {
return false;
 }
}

/**
 * 判断是不是合法字符
* c 要判断的字符
*/
public static boolean isLetter(String c) {
boolean result = false;
if (c==null || c.length()<0) {
 return false;
}
//a-z
if (c.compareToIgnoreCase("a")>=0 && c.compareToIgnoreCase("z")<=0) {
 return true;
}
//0-9
if (c.compareToIgnoreCase("0")>=0 && c.compareToIgnoreCase("9")<=0) {
return true;
}
//. - _
if (c.equals(".") || c.equals("-") || c.equals("_") ) {
return true;
}
return result;
}

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