我有一个字符串“S”。只有单引号中的子字符串必须分配给字符串数组。它可能不是必需的，单引号中的替代词。
String S = "Username 'user1'
Username2 'user2'
Usermane3 'user3' 'user4'";
它必须如下分配(仅限带有单引号的子串)
String Username[] ={'user','user1','user2','user4'};
我尝试过的
String s1 = S.replace(System.getProperty("line.separator"), " ");
//replacing newline with single space
String Username[] = s1.split(" ");
//separating string into sub-string
Username[]={Username,'user1',Username2,'user2',Username3, 'user3','user4'};
您可以使用定界符拆分输入并获取备用字符串。
String S = "Username 'user1' Username2 'user2 user21' Usermane3 'user3'";
String[] tokens = S.split("'");//use delimiter as ' to get the value inside the quote
String[] usernames = new String[tokens.length / 2];
for (int i = 1, k = 0; i < tokens.length; i += 2) {
System.out.println(tokens[i]);
usernames[k++] = tokens[i];
}
如果没有规则单个Username 会有一个user1 like
String S = "Username 'user1' Username2 'user2' Usermane3 'user3' 'user4'";
您可以使用逻辑来仅获取引号中的字符串，如下所示。
String S = "Username 'user1' Username2 'user2' Usermane3 'user3' 'user4'";
ArrayList<String> words = new ArrayList();
String word = "";
boolean startQuote = false;
for (int i = 0; i < S.length(); ++i) {
char ch = S.charAt(i);
if (ch == '\'') {
if (word.equals(""))
startQuote = true;
else {
words.add(word);
word = "";
startQuote = false;
}
}
else if (startQuote) {
word += ch;
}
}
System.out.println(words);