Java 简化正则表达式的使用

使用

RegexString.with(string).pattern(pattern).start() + 后续操作(matches,find或者是replace)

源码

package com;

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


public class RegexString {

  private String string;
  private Pattern pattern;
  private Matcher matcher;

  ////////////////////// Constructor //////////////////////

  
  public RegexString(String str) {
    setString(Objects.requireNonNull(str));
  }

  ////////////////////// Normal Method //////////////////////

  
  public RegexString pattern(String regex) {
    setPattern(Pattern.compile(regex));
    return this;
  }

  
  public RegexString pattern(String regex, int flags) {
    setPattern(Pattern.compile(regex, flags));
    return this;
  }

  
  public RegexString start() {
    setMatcher(pattern.matcher(string));
    return this;
  }

  
  public String replace(String replacement) {
    return getMatcher().replaceAll(replacement);
  }

  
  public boolean matches() {
    return getMatcher().matches();
  }

  
  public boolean find() {
    return getMatcher().find();
  }

  
  public String matchString() {
    return getMatcher().group();
  }

  
  public int matchStart() {
    return getMatcher().start();
  }

  
  public int matchEnd() {
    return getMatcher().end();
  }

  ////////////////////// Static Method //////////////////////

  
  public static RegexString with(String str) {
    return new RegexString(str);
  }

  ////////////////////// Getter & Setter //////////////////////

  public String getString() {
    return string;
  }

  public void setString(String string) {
    this.string = string;
  }

  public Pattern getPattern() {
    return pattern;
  }

  public void setPattern(Pattern pattern) {
    this.pattern = pattern;
  }

  public Matcher getMatcher() {
    return matcher;
  }
  public void setMatcher(Matcher matcher) {
    this.matcher = matcher;
  }
}

示例

package com;

public class Main {

  public static void main(String args[]) {

    // 查找文本
    {
      String src = "This is my small example string which I'm going to use for pattern matching.";
      RegexString string = RegexString.with(src).pattern("\w+").start();
      while (string.find()) {
 System.out.println(string.matchStart() + "," + string.matchEnd() + " : " + string.matchString());
      }
    }

    // 匹配
    {
      String src = "This is my small example string which I'm going to use for pattern matching.";
      if (RegexString.with(src).pattern("^This.+$").start().matches()) {
 System.out.println("Yes");
      }
    }

    // 替换文本
    {
      String src = "This is my small example string which I'm going to use for pattern matching.";
      System.out.println(RegexString.with(src).pattern("\w+").start().replace("Regex"));
    }
    // 去掉字符串首尾的空格,以及字符串中间多余的字符串
    {
      String src = "  This  is  my small example string  which I'm  going to  use for pattern matching.   ";
      String tmp = RegexString.with(src).pattern("^\s+|\s+$").start().replace("");
      String des = RegexString.with(tmp).pattern("\s+").start().replace(" ");
      System.out.println(""" + des + """);
    }
  }
}

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