檢查輸入內容是否僅包含某些字符

Question

我需要檢查我的輸入字符串僅包含字母字符，星號，空格和制表符。

我試過了，但是不起作用：

firstStr.matches(".*[a-zA-Z].*.*[\\t].*.*[\\s].*") 

Answer 1

使用此正則表達式檢查字符串是否僅包含字母，空格，星號，制表符：

firstStr.matches("[a-zA-Z *\t]+")

你是接近，但你需要一個單一的字符類。

Answer 2

我相信這應該有效：

[\\*\\t\\sa-zA-Z]+  //if you want to ensure that there is atleast 1 character in the string

[\\*\\t\\sa-zA-Z]*  //if it is ok to have 0 or more characters in the string

\\* will match an asterisk
\\t will match tab
\\s will match whitespace
a-zA-Z will match alphabetical chars
[...]+ ensures there are atleast one of the expression in the brackets
[...]* means there is 0 or more of the expression in the brackets