java - 正则表达式单词末尾的特定字符

Question

我想替换每个以“h”结尾的单词，但如果“h”之前的字符是这些 (l|m|t|s) 之一，则不需要更换。这就是我在 java 中所做的:

String t1="samplh sampleh samplah sampmh";
System.out.print(t1.replaceAll("(l|m|t|s)h","#"));

但它给了我这个(替换分组字符和“h”):

samp# sampleh samplah samp#

它应该看起来像这样(只是“h”必须替换为“#”):

sampl# sampleh samplah sampm#

Answer 1

这会起作用:

Find what:    \b(\w+)([^lmts])(h)\b
Replace with: $1$2#

Java:

import  java.util.regex.Pattern;
import  java.util.regex.Matcher;

/**
   <P>{@code java ReplaceHAtEnd}</P>
 **/
public class ReplaceHAtEnd  {
   public static final void main(String[] igno_red)  {

      String sRegex = "" +
         "\\b" +            //word start
            "(\\w+)" +      //one or more characters
            "([^lmts])" +   //character other than l,m,t,s
            "(h)" +         //the letter 'h'
         "\\b";             //word end

      String sToSearch = "samplh sampleh samplah sampmh";
      String sRplcWith = "$1$2#";
      Matcher m = Pattern.compile(sRegex).matcher(sToSearch);

      StringBuffer sb = new StringBuffer();
      while(m.find())  {
         m.appendReplacement(sb, sRplcWith);
         m.appendTail(sb);
      }

      System.out.println(sb);
   }
}

输出:

[C:\java_code\]java ReplaceHAtEnd
samplh sample# samplah sampmh sampla# sampmh

在 regexplanet 上尝试:http://fiddle.re/hnqvf

或Debuggex