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 Through Stateflow Structures.

Version History

Introduced in R2021b