java - 正则表达式查找除数字后面的所有字符

Question

我不擅长正则表达式，但我正在努力寻找一种方法来将java中字符串字母的大小写从小写更改为大写

Java 有一个非常好的方法，称为 toUpperCase()，但是，由于两个原因，这并没有真正帮助我。

首先，我想获得这样一个正则表达式的引用，因为我在任何地方都找不到它，并且其次，因为它会改变所有字符的大小写。

但在某些情况下，我想保持较低的字符以避免混淆，并使其看起来更好。

Good   Bad
2i   =  2I
2o   =  2O
1st  = 1ST
2nd  = 2ND
etc...

是否也可以添加条件？例如

"don't replace if the sequence 'st' appears after the number '1' even if there is a space between"
"don't replace if the sequence 'nd' appears after the number '2' even if there is a space between"
etc...

我想知道是否有人可以帮助我生成正则表达式来选择这些字符

提前谢谢

Answer 1

如果这是您需要的，请查看:

final String[] s = { "2 nd blah", 
                "1st foo", 
                "foo 2nd bar", 
                "blahblah1stfounditimmediately", 
                "blah 3rd foo", 
                "blah55th foo", 
                "66 th bar"
                 };
        final Pattern p = Pattern.compile("(1 ?ST|2 ?ND|3 ?RD|\\d+ ?TH)");
        Matcher m = null;
        String t;
        for (final String x : s) {
            t = x.toUpperCase();
            m = p.matcher(t);
            while (m.find()) {
                System.out.println(x + " ---> " + t.replaceAll(m.group(1), m.group(1).toLowerCase()));
            }
        }

以上代码的输出:

2 nd blah ---> 2 nd BLAH
1st foo ---> 1st FOO
foo 2nd bar ---> FOO 2nd BAR
blahblah1stfounditimmediately ---> BLAHBLAH1stFOUNDITIMMEDIATELY
blah 3rd foo ---> BLAH 3rd FOO
blah55th foo ---> BLAH55th FOO
66 th bar ---> 66 th BAR

编辑以获得更好的代码格式。