Question

我对正则表达式并不擅长，但我正在努力寻找一种方法来改变java中字母从低位到大写字母的情况

Java有一个非常好的方法叫做toUpperCase（）但是，由于两个原因，这对我没有帮助。

首先，我希望有一个这样的正则表达式的参考，因为我无法在任何地方找到它，并且其次，因为它将改变所有角色的情况。

然而，有些情况下我希望保持较低的字符以避免混淆，并使其更好看。

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

是否可以添加条件？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协助我生成正则表达式以选择那些字符

提前谢谢

Answer 1

如果你需要的话，请看这个：

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

编辑更好的代码格式。

Answer 2

怎么样？

var str = '2 nd';

if (!/\d+(\s*)(nd|st)/i.test(str)) {
    str = String(str).toUpperCase();
}

console.log(str);

正则表达式查找所有字符但是数字之后的字符

2 个答案: