How to determine whether a string contains English in java

1. Determine whether the string is all in English

boolean result = str.matches("[a-zA-Z]+");    //true:全文英文
str.matches("[a-zA-Z0-9]+")   //判断英文和数字

2. Extract all the English in the string

str = str.replaceAll("[^a-z^A-Z]", "");    //"[^a-z^A-Z]"改为"[^a-z^A-Z^0-9]"即获取所有的英文和数字

3. Determine the string Does it contain English

String regex = ".*[a-zA-z].*";
str.matches(regex);   //true：含有英文

Recommended tutorial: java introductory tutorial

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