如果允許使用者隨意輸入, 容易有風險, 如果只允許大小寫英文與減號, 寫法如下:
String filename = "abc.xyz";
String pattern = "^[-a-zA-Z0-9]+$";
boolean is_match_pattern = filename.matches(pattern);不知道為什麼, pattern = “^[-a-zA-Z0-9]+” 的效果在 java 裡與 pattern = “^[-a-zA-Z0-9]+$” 相同, 在 javascript 裡, 可以測出不同的結果.
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