How recognize an array in string? With regex in Java

Question

I'm trying to make an regular expression to recognize if a given String is an array or not.

For example,

String foo = "a[1]";    // true
String bar = "b[]";     // true
String tar = "test";    // false
String zoo = "b[][]"    // true

How can I recognize it?

I try something like this:

Pattern p = Pattern.compile("[_a-zA-Z][_a-zA-Z0-9]*");

But I don't know how represent the "[" and "]" characters.

Thank's in advance.

Answer 1

Pattern p = Pattern.compile("[_a-zA-Z]+(?:\\[[_a-zA-Z0-9]*\\])+");

This should do it for you. escape [] .See demo.

https://regex101.com/r/sS2dM8/17

Answer 2

试试这个它匹配所有数组类型

[a-zA-Z_]+(?:\\[\d*\\])+