在java中使用regex替换括号中的逗号 [英] Replace comma in parentheses using regex in java

问题描述

我想仅在内部括号中替换逗号。

I want to replace comma when its inside parentheses only.

例如

 Progamming languages (Java, C#, Perl)

TO

Progamming languages (Java or C# or Perl)

但是它不应该在以下字符串中重复逗号

but it should not repace comma in following string

Progamming languages Java, C#, Perl

代码

它会正确替换但不匹配。

It will replace correctly but its not matching up.

 String test  = "Progamming languages (Java, C#, Perl)";
 String test1 = "Progamming languages Java, C#, Perl"


 String foo = replaceComma(test);
 String foo1 = replaceComma(test1);


 private static String replaceComma(String test)
 {
    String patternStr= "\\((?:.*)(,)(?:.*)\\)";
    Pattern pattern = Pattern.compile(patternStr);
    Matcher matcher= pattern.matcher(test);

    if(matcher.matches())
    {
      return  test.replaceAll("(,)", " or ");
    }

    return  test;

 }

更新

String.replaceAll（（，），或）; 在你有这样的字符串时不起作用

String.replaceAll("(,)", " or "); will not work when you have string like this

String test =学习，语言（Java，C＃，Perl）;

String test = "Learning, languages (Java, C#, Perl)";

所以你必须使用@ polygenelubricants code

so you have to use @polygenelubricants code

推荐答案

你可以使用正 lookahead （？= ...）喜欢这样：

You can use positive lookahead (?=…) like this:

    String COMMA_INSIDE = ",(?=[^()]*\\))";
    String text = "a, b, c, (d, e, f), g, h, (i, j, k)";
    System.out.println(
        text.replaceAll(COMMA_INSIDE, " OR")
    );
    // a, b, c, (d OR e OR f), g, h, (i OR j OR k)

这与逗号匹配，但前提是右边的第一个括号是结束类型。

This matches a comma, but only if the first parenthesis to its right is of the closing kind.

[^ ...] 是否定角色类。 [^（）] 匹配除括号外的任何内容。 * 为零或更多重复。 \）（写为\\）作为Java字符串文字）匹配右括号从字面上看。反斜杠逃脱了分组的特殊元字符。

The [^…] is a negated character class. [^()] matches anything but parentheses. The * is zero-or-more repetition. The \) (written as "\\)" as a Java string literal) matches a closing parenthesis, literally. The backslash escapes what is otherwise a special metacharacter for grouping.

这假设输入字符串格式正确，即括号始终是平衡的而不是嵌套的。

This assumes that the input string is well-formed, i.e. parentheses are always balanced and not nested.

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