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In this guide, we will discuss Erlang substr. The method returns the sub string from the original string based on the starting position and number of characters from the starting position.

Syntax

substr(str1,start,number)

Parameters

• str1 − This is the string from which the sub string needs to be extracted.
• Start − This is the starting position from where the sub string should start.
• Number − This is the number of characters which need to be present in the substring.

Return Value

Returns the sub string from the original string based on the start position and the number.

For example

-module(helloworld). 
-import(string,[substr/3]). 
-export([start/0]). 

start() ->
   Str1 = "hello World", 
   Str2 = substr(Str1,2,5), 
   io:fwrite("~p~n",[Str2]).

Output

When we run the above program, we will get the following result.

“ello”

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