Java 如何使用`string.startsWith()` 方法忽略大小写？
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How to use `string.startsWith()` method ignoring the case?
提问by Sheetal Bhatewara
I want to use string.startsWith()method but ignoring the case.
我想使用string.startsWith()方法但忽略大小写。
Suppose I have String"Session" and I use startsWithon "sEsSi" then it should return true.
假设我有String“Session”并且我startsWith在“sEsSi”上使用，那么它应该返回true.
How can I achieve this?
我怎样才能做到这一点？
采纳答案by Nemesis
Use toUpperCase()or toLowerCase()to standardise your string before testing it.
在测试之前使用toUpperCase()或toLowerCase()来标准化您的字符串。
回答by Rohit Jain
One option is to convert both of them to either lowercase or uppercase:
一种选择是将它们都转换为小写或大写：
"Session".toLowerCase().startsWith("sEsSi".toLowerCase());
"Session".toLowerCase().startsWith("sEsSi".toLowerCase());
This is wrong. See: https://stackoverflow.com/a/15518878/14731
这是错误的。参见：https: //stackoverflow.com/a/15518878/14731
Another option is to use String#regionMatches()method, which takes a boolean argument stating whether to do case-sensitive matching or not. You can use it like this:
另一种选择是使用String#regionMatches()方法，它接受一个布尔参数，说明是否进行区分大小写的匹配。你可以这样使用它：
String haystack = "Session";
String needle = "sEsSi";
System.out.println(haystack.regionMatches(true, 0, needle, 0, 5)); // true
It checks whether the region of needlefrom index 0till length 5is present in haystackstarting from index 0till length 5or not. The first argument is true, means it will do case-insensitive matching.
它检查needle从索引0到长度的区域是否5存在于haystack从索引0到长度的开始5。第一个参数是true, 意味着它将进行不区分大小写的匹配。
And if only you are a big fan of Regex, you can do something like this:
如果您是Regex 的忠实粉丝，您可以执行以下操作：
System.out.println(haystack.matches("(?i)" + Pattern.quote(needle) + ".*"));
(?i)embedded flag is for ignore case matching.
(?i)嵌入标志用于忽略大小写匹配。
回答by agad
myString.toLowerCase().startsWith(starting.toLowerCase());
回答by newuser
try this,
尝试这个，
String session = "Session";
if(session.toLowerCase().startsWith("sEsSi".toLowerCase()))
回答by RamonBoza
You can always do
你总能做到
"Session".toLowerCase().startsWith("sEsSi".toLowerCase());
回答by Prasad Kharkar
You can use someString.toUpperCase().startsWith(someOtherString.toUpperCase())
您可以使用 someString.toUpperCase().startsWith(someOtherString.toUpperCase())
回答by rachit
use starts with and toLowerCase together
一起使用以和 toLowerCase 开头
like this
像这样
"Session".toLowerCase().startsWith("sEsSi".toLowerCase());
