...Java程序检查字符串是否为字母数字 (Java Program to Check String is Alphanumeric or not) java.util.regex.*; class AlphanumericExample...在上面的示例中,我在matches()方法中使用了模式“ [a-zA-Z0-9] +”。 这意味着字符串可以包含介于a到z,A到Z和0到9之间的字符。这里+表示字符串可以包含一...
extract substring string range "lorem ipsum" 6 10 string.sub("lorem ipsum", 7, 11) "lorem ipsum".substr(6, 5)"lorem ipsum".substring(6, 11) "lorem ipsum".substring(6, 11) chr and ord format %c 65scan A %c ascii_value string.char(65)string.byte("A") String.fromCharCode(65)"...
extract substring string range "lorem ipsum" 6 10 string.sub("lorem ipsum", 7, 11) "lorem ipsum".substr(6, 5) "lorem ipsum".substring(6, 11) "lorem ipsum".substring(6, 11) chr and ord format %c 65scan A %c ascii_value string.char(65) string.byte("A") String.fromCharCode(65...