GWT中的RegExp和MatchResult仅返回第一个匹配项 [英] RegExp and MatchResult in GWT returns only first match

问题描述

我正在尝试在GWT中使用RegExp和MatchResult。它只返回一个单词中的第一个匹配项。我需要所有的三个克，我，米。我尝试了全球化，多行和不区分大小写的gim。但它不起作用。请找到下面的代码。

预期的输出是，无论大小写如何，它都应该在On Condition中找到3个匹配的on。

  import com.google.gwt.regexp.shared.MatchResult; 
 import com.google.gwt.regexp.shared.RegExp; 
 
 public class PatternMatchingInGxt {
 
 public static final String dtoValue =On Condition; 
 public static final String searchTerm =on; 
 
 public static void main（String args []）{
 String newDtoData = null; 
 RegExp regExp = RegExp.compile（searchTerm，mgi）; 
 if（dtoValue！= null）{
 MatchResult matcher = regExp.exec（dtoValue）; 
 boolean matchFound = matcher！= null; 
 if（matchFound）{
 for（int i = 0; i< matcher.getGroupCount（）; i ++）{
 String groupStr = matcher.getGroup（i）; 
 newDtoData = matcher.getInput（）。replaceAll（groupStr，+ i）; 
 System.out.println（newDtoData）; 
} 
} 
} 
} 
} 
  

解决方案

如果您需要收集所有匹配项，请运行 exec ，直到找不到匹配项。 b

要替换多次出现的搜索字词，请使用包含捕获组的 模式使用 RegExp＃replace（） >（我无法使 $& 反向引用GWT中的整个匹配工作）。

更改代码如下所示：

  if（dtoValue！= null）{
 
 //显示所有匹配
 RegExp regExp = RegExp.compile（searchTerm，gi）; 
 MatchResult matcher = regExp.exec（dtoValue）; 
 while（matcher！= null）{
 System.out.println（matcher.getGroup（0））; //打印匹配值（演示）
 matcher = regExp.exec（dtoValue）; 
} 
 
 //将所有searchTerm事件包装为1和0 
 RegExp regExp1 = RegExp.compile（（+ searchTerm +），gi）; 
 newDtoData = regExp1.replace（dtoValue，1 $ 10）; 
 System.out.println（newDtoData）; 
 // => 1On0 C1on0diti1on0 
} 
  

请注意 m （多行修饰符）只会影响模式中的 ^ 和 $ ，因此您不需要它。

I am trying to use RegExp and MatchResult in GWT. It returns only first occurrence in a word. I need to have all the three "g", "i", "m". I tried "gim" which is global, multiline and case insensitive. But it is not working. Please find the code below. Thanks in advance.

The expected output is, it should find 3 matches of "on" in "On Condition" irrespective of the case.

import com.google.gwt.regexp.shared.MatchResult;
import com.google.gwt.regexp.shared.RegExp;

public class PatternMatchingInGxt {

public static final String dtoValue = "On Condition";
public static final String searchTerm = "on";

public static void main(String args[]){
    String newDtoData = null;
    RegExp regExp = RegExp.compile(searchTerm, "mgi");
    if(dtoValue != null){
        MatchResult matcher = regExp.exec(dtoValue);
        boolean matchFound = matcher != null;
        if (matchFound) {
            for (int i = 0; i < matcher.getGroupCount(); i++) {
                String groupStr = matcher.getGroup(i);
                newDtoData = matcher.getInput().replaceAll(groupStr, ""+i);
                System.out.println(newDtoData);
            }
        }
    }
  }
}

解决方案

If you need to collect all matches, run exec until you get no match.

To replace multiple occurrences of the search term, use RegExp#replace() with a pattern wrapped with a capturing group (I could not make $& backreference to the whole match work in GWT).

Change the code as follows:

if(dtoValue != null){

    // Display all matches
    RegExp regExp = RegExp.compile(searchTerm, "gi");
    MatchResult matcher = regExp.exec(dtoValue);
    while (matcher != null) { 
        System.out.println(matcher.getGroup(0));  // print Match value (demo)
        matcher = regExp.exec(dtoValue); 
    }

    // Wrap all searchTerm occurrences with 1 and 0
    RegExp regExp1 = RegExp.compile("(" + searchTerm + ")", "gi");
    newDtoData = regExp1.replace(dtoValue, "1$10");
    System.out.println(newDtoData);
    // => 1On0 C1on0diti1on0
}

Note that m (multiline modifier) only affects ^ and $ in the pattern, thus, you do not need it here.

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