使用子字符串作为分隔符拆分或标记Java字符串

Question

How to split or tokenise a String in java not based on regex but based on a substring?

String str = "{A={111={i=[a,b,c],ii=[e,f]}, 222={iii=[a,e]}}, B={333={i= [b,c]}}};

Now I want to tokenise or split the string based on substring "}}," and not regex "}},".

Answer 1

String str = "{A={111={i=[a,b,c],ii=[e,f]}, 222={iii=[a,e]}}, B={333={i= [b,c]}}}";
String[] split = str.trim().split("}},");
Arrays.stream(split).forEach(s-> System.out.println(s));

Answer 2

Although the String.split(String regex) function specifies that it takes a regular expression as a parameter, that does not stop you from escaping any special characters and splitting on a literal string.

To escape special characters in a regular expression, you can make use of the Pattern.quote(String s) function, or you can escape the individual characters using backslashes \\\\ :

String escapedStr = Pattern.quote("}},");

String alternativeEscapedStr = "\\}\\},";

For the example you have provided however, you shouldn't need to escape anything:

String str = "{A={111={i=[a,b,c],ii=[e,f]}, 222={iii=[a,e]}}, B={333={i= [b,c]}}}";

String[] splitStr = str.split(Pattern.quote("}},"));
System.out.println(Arrays.toString(splitStr));

String[] splitStr2 = str.split("}},");
System.out.println(Arrays.toString(splitStr2));

Output:

[{A={111={i=[a,b,c],ii=[e,f]}, 222={iii=[a,e],  B={333={i= [b,c]}}}]
[{A={111={i=[a,b,c],ii=[e,f]}, 222={iii=[a,e],  B={333={i= [b,c]}}}]