Java String split split special character __J2EE

Java String split split special character
You need to be aware of the following special characters (all require escape \ \)
"|" "." "*" "_" "+" ""
Api:
Public string[] Split (String regex) splits this string around matches of the given regular.
A parameter regex is a regular-expression match pattern rather than a simple string, and he may have unexpected results for some special characters,
For example, test the following code: Vertical Bar | Delimited string, you will not get the desired result string[] AA = "AAA|BBB|CCC". Split ("|");
The "|" divider string, while being able to execute, is not intended, "\\|" The correct result can be obtained after escaping.
string[] aa = "AAA|BBB|CCC". Split ("\\|"); (right)
Running with the vertical * separator string will throw the java.util.regex.PatternSyntaxException exception, with the plus sign +.
string[] aa = "AAA*BBB*CCC". Split ("*");
string[] aa = "AAA|BBB|CCC". Split ("\\*");(right)
Obviously, + * is not a valid pattern-matching rule expression, with the "\\*" "\\+" escaped to get the correct result.

Also, if you want to use the character in a string, you also need to escape. The first expression of "aaaa\bbbb" This string should be "AAAA\\BBBB",
If you want to separate, you should be able to get the correct result: string[] aa = "AAA\\BBB\\BCCC". Split ("\\\");(right)