extractBefore

Extract substring before position in Stateflow chart

Since R2021b

Syntax

newStr = extractBefore(str,subStr)

newStr = extractBefore(str,pos)

Description

newStr = extractBefore(str,subStr) returns the substring of str that ends before the first occurrence of the substring subStr.

newStr = extractBefore(str,pos) returns the substring of str that ends before the character position pos.

Note

The extractBefore operator is not supported in Stateflow^® charts that use C as the action language. For similar functionality, use substr.

Examples

Select Text Before Substring

Extract substring "Hello" from a longer string.

str = "Hello, world!";
newStr = extractBefore(str,", world");

Select Text Before a Position

Extract substring "Hello" from a longer string.

str = "Hello, world!";
newstr = extractBefore(str,6);

Input Arguments

str — Input string

string scalar

Input string, specified as a string scalar. Enclose literal strings with double quotes.

Example: "Hello"

substr — Substring

string scalar

Substring, specified as a string scalar. Enclose literal strings with double quotes.

Example: "Hello"

pos — Character position

positive integer

Character position, specified as a positive integer.

Limitations

• This operator does not support the use of Stateflow structure fields or messages. For more information about structures in Stateflow, see Access Bus Signals.

Version History

Introduced in R2021b