Home  >  Article  >  Web Front-end  >  Use regular expressions to determine whether a string can be converted to a number

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

php中世界最好的语言
php中世界最好的语言Original
2018-06-09 14:36:061597browse

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]);
      }
    }
  }
}

相信看了本文案例你已经掌握了方法,更多精彩请关注php中文网其它相关文章!

推荐阅读:

node+token做出用户验证

打包文件体积过大如何处理

The above is the detailed content of Use regular expressions to determine whether a string can be converted to a number. For more information, please follow other related articles on the PHP Chinese website!

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn