Introduction to the method of judging whether it is English in java

When doing development, we often need to judge whether a certain character or string is in English. Let's take a look at the method of judging whether it is English in Java: (Recommended : java video tutorial)

1. Determine whether all the English words in the string are 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 words 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 whether the string contains English

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

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