java - Java中使用模式匹配查找不包含数字的字符串数据

Question

期待match仅 String 带有 no数字，使用 regex 中的 \D。

每个字符串都显示为false，但为什么呢？

输出:

thufir@dur:~/NetBeansProjects/parseCSV$ 
thufir@dur:~/NetBeansProjects/parseCSV$ gradle run

> Task :run                                                                                     
Feb. 16, 2020 5:24:49 A.M. parseCSV.FileHelper processLines
INFO:           false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: z10               false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: y9                false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: x7                false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: atrib6            false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: alice             false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: home5             false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: cell4             false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: sue               false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: phone3            false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: phone2            false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: phone1            false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: joe               false
Feb. 16, 2020 5:24:50 A.M. parseCSV.FileHelper processLines
INFO: people            false

BUILD SUCCESSFUL in 1s
3 actionable tasks: 1 executed, 2 up-to-date
thufir@dur:~/NetBeansProjects/parseCSV$                          

相关方法from类:

public void processLines() {
    String regex = "\\D";
    boolean isDigit = false;
    for (String s : lines) {
        isDigit = Pattern.matches(regex, s);
        log.info(s + "\t\t" + Boolean.toString(isDigit)
        );

    }

Answer 1

您应该使用正则表达式模式 ^\D+$，它从头到尾匹配一个或多个个连续的非数字字符。由于 Pattern#matches 隐式覆盖整个字符串，因此我们可以使用 \D+:

public void processLines() {
    String regex = "\\D+";
    boolean isDigit = false;
    for (String s : lines) {
        isDigit = Pattern.matches(regex, s);
        log.info(s + "\t\t" + Boolean.toString(isDigit)
        );
    }
}