String. Split ()

I have used some of them in the application. I will summarize them for your reference only:
1. If ". ", must be written as follows: string. split ("\\. "), in this way, the correct separation is not allowed using string. split (". ");
2. If "|" is used as the separator, it must be written as follows: string. split ("\ |"), in order to correctly separate, cannot use string. split ("| ");
"." And "|" are escape characters and must be added "\\";
3. If a string contains multiple delimiters, you can use "|" as a hyphen, for example, "acount =? And UU =? Or n = ?", Use string. Split ("and | or") to separate all three ");
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When the string. split method is used to separate strings, if some special characters are used as separators, the expected results may not be obtained.

Public String [] Split (string RegEx)
Splits this string around matches of the given regular expression.

The RegEx parameter is a regular-expression matching mode instead of a simple string. It may produce unexpected results for some special characters, such as the following testCode:

Use vertical bars | to separate strings and you will not get the expected results

String [] AA = "AAA | BBB | CCC". Split ("| ");
// String [] AA = "AAA | BBB | CCC". Split ("\\|"); in this way, the correct result can be obtained.

For (INT I = 0; I <AA. length; I ++ ){
System. Out. println ("--" + AA [I]);
}

Java. util. RegEx. patternsyntaxexception will be thrown. In other similar cases:

1) plus sign +
2) asterisk *
string [] AA =" AAA * BBB * CCC ". split ("\ *"); to get the correct result
3) and escape if you want to use the "\" character in the string. the expression "AAAA \ BBBB" should be "AAAA \ BBBB" first. If it is to be separated, the correct result should be obtained:
string [] AA = "AAA \ BBB \ BCCC ". split (\\\\);
4) full stop.