如何查看子字符串是否存在于 Java 1.4 中的另一个字符串中？
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How do I see if a substring exists inside another string in Java 1.4?
提问by joe
How can I tell if the substring "template" (for example) exists inside a String object?
如何判断子字符串“模板”（例如）是否存在于 String 对象中？
It would be great if it was not a case-sensitive check.
如果它不是区分大小写的检查，那就太好了。
采纳答案by CoverosGene
Use a regular expression and mark it as case insensitive:
使用正则表达式并将其标记为不区分大小写：
if (myStr.matches("(?i).*template.*")) {
// whatever
}
The (?i)turns on case insensitivity and the .*at each end of the search term match any surrounding characters (since String.matchesworks on the entire string).
在（我）不区分大小写和转弯。*在搜索项的每一端匹配任何字符周围（因为String.matches适用于整个字符串）。
回答by John Ellinwood
For a case insensitive search, to toUpperCase or toLowerCase on both the original string and the substring before the indexOf
对于不区分大小写的搜索，对原始字符串和 indexOf 之前的子字符串都使用 toUpperCase 或 toLowerCase
String full = "my template string";
String sub = "Template";
boolean fullContainsSub = full.toUpperCase().indexOf(sub.toUpperCase()) != -1;
回答by Dan Lew
You can use indexOf() and toLowerCase() to do case-insensitive tests for substrings.
您可以使用 indexOf() 和 toLowerCase() 对子字符串进行不区分大小写的测试。
String string = "testword";
boolean containsTemplate = (string.toLowerCase().indexOf("template") >= 0);
回答by Issac Balaji
String word = "cat";
String text = "The cat is on the table";
Boolean found;
found = text.contains(word);
回答by Raj
public static boolean checkIfPasswordMatchUName(final String userName, final String passWd) {
if (userName.isEmpty() || passWd.isEmpty() || passWd.length() > userName.length()) {
return false;
}
int checkLength = 3;
for (int outer = 0; (outer + checkLength) < passWd.length()+1; outer++) {
String subPasswd = passWd.substring(outer, outer+checkLength);
if(userName.contains(subPasswd)) {
return true;
}
if(outer > (passWd.length()-checkLength))
break;
}
return false;
}
