在多个符号上拆分java中的字符串

Question

I want to split a string when following of the symbols encounter "+,-,*,/,=" I am using split function but this function can take only one argument.Moreover it is not working on "+". I am using following code:-

Stringname.split("Symbol");

Thanks.

Answer 1

String.split takes a regular expression as argument.

This means you can alternate whatever symbol or text abstraction in one parameter in order to split your String .

See documentation here .

Here's an example in your case:

String toSplit = "a+b-c*d/e=f";
String[] splitted = toSplit.split("[-+*/=]");
for (String split: splitted) {
    System.out.println(split);
}

Output:

a
b
c
d
e
f

Notes:

• Reserved characters for Pattern s must be double-escaped with \\\\ . Edit : Not needed here.
• The [] brackets in the pattern indicate a character class.
• More on Pattern s here .

Answer 2

You can use a regular expression:

String[] tokens = input.split("[+*/=-]");

Note: - should be placed in first or last position to make sure it is not considered as a range separator.

Answer 3

You need Regular Expression. Addionaly you need the regex OR operator:

String[]tokens = Stringname.split("\\+|\\-|\\*|\\/|\\=");

Answer 4

For that, you need to use an appropriate regex statement. Most of the symbols you listed are reserved in regex, so you'll have to escape them with \\ .

A very baseline expression would be \\+|\\-|\\\\|\\*|\\= . Relatively easy to understand, each symbol you want is escaped with \\ , and each symbol is separated by the | (or) symbol. If, for example, you wanted to add ^ as well, all you would need to do is append |\\^ to that statement.

For testing and quick expressions, I like to use www.regexpal.com