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split

Returns an array of string values that represent the tokens from the value expression that are separated by the separator expression.

Note that in order to split a special character such as '|', one needs to escape the string with a '\' character.  The '\' may need to be escaped as well, so in this case one will end up with String:split(someText, "\\|").

string[] result = String:split("abc def", " ");
string first = result.get(0); //first = "abc"
string second = result.get(1); //second = "def"

length

Returns the length of the string argument.

int i = String:length("Hello world");

substring

Substring of a string based on index positions.

string s = String:substring("Hello World", 1, 4); //s = "ello"

lower

Convert string to lowercase.

string s = String:lower("Hello World"); //s = "hello world"

upper

Convert string to uppercase.

string s = String:upper("Hello World"); //s = "HELLO WORLD"

startsWith

Check if the beginning part of a string matches another string.

bool b = String:startsWith("Hello World", "Hello"); //b = true

Check if the ending part of a string matches another string.

bool b = String:endsWith("Hello World", "World"); //b = true

indexOf

Returns the index within this string of the first occurrence of the specified substring.

int i = String:indexOf("Hello World", "llo W"); //i = 2

join

Joins a collection of strings into one result string with the specified join character.

string[] strings;
strings.append("abc");
strings.append("def");
string s = String:join(strings, " "); //s = "abc def"

message.default_warning = You've been warned.

string s = String:translate("message.default_warning"); //s = "You've been warned."

if (String:regexMatch("27000111abc","^27[0-9]{9,}$") == false) {
	Mez:alertError("alert.invalid.phonenum");
}