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Use regular expressions to determine whether a string can be converted to a number

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Release: 2018-06-09 14:36:06
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这次给大家带来使用正则判断字符串是否能转为数字,使用正则判断字符串是否能转为数字的注意事项有哪些,下面就是实战案例,一起来看一下。
代码如下所示:

package java_test;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
 * @author: gznc_pcc
 * @date:2018年6月1日 10:50:38
 * @version :
 * 
 */
class Main 
{
  public static void main(String[] args) {
    String lineString = "[\"1\"]";
    String line = "[\"on\",\"1\",\"5\",\"8\",\"10\"]";
    lineString = line.replaceAll("[\"\\[\\]]", "");//用""替换" [ ]
    String[] word = lineString.split(","); //以,切割
    System.out.println(lineString);
    for(int i=0;i<word.length;i++){
      Pattern pattern = Pattern.compile("[0-9]*"); //正则,匹配数字
      Matcher matcher = pattern.matcher(word[i]); 
      if(matcher.matches()){
        System.out.println("1:可以转换");
        System.out.println(Integer.parseInt(word[i]));
      }
      else {
        System.out.println("2:不能转换");
        System.out.println(word[i]);
      }
    }
  }
}
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