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How To Use The Find() String Method In A Modern C++ App

How can I find a string inside another string? What kind of methods I can use in a C++ app to find a string in a std::string? How can I use find() methods with strings?

Modern C++ uses Strings, Wide Strings, and Unicode Strings to support worldwide languages. Strings (std::string) uses char as the character type which means they are ASCII chars and they are an instantiation of the basic_string class template. In C++, there are several typedefs for common character types and one of them is std::string types that are defined in header <string>.

strings are the string class for byte characters represented with string and alphanumeric characters are stored and displayed in string forms. In other terms, string stores the alphanumeric text with 1-byte chars called char. Strings are the instantiation of the basic_string class template that uses char as the character type. In modern C++, simply we can define a string as below,

Strings (string) are a class contains arrays of characters with useful methods, and we can access, or modify their characters easily. In C++, while string contents are defined between ” and “, characters are defined between ‘ and ‘.

The string has methods to append, assign, copy, align, replace or operate with other strings. These methods can be used in all string methods with their appropriate syntax. We can find a string in another string with find() method.

How do I use the find() Method of string in a C++ app?

The find() method is a String Method that finds a string in its string . There can be a position to start as a second parameter, search begins from this position to the end of string. find() method returns the position of the first character of the found substring. If no such substring is found in that string then it returns npos of the string (std::string::npos).

Syntax:

How to search a string in C++ with the find() Method

Simply we can find a string in a string by using its find method as given example below.

Is there a full C++ example of using the find() method of a string?

This full C++ example below shows how we can find a string in another string by using find() method,

Output of this code will print the original string and prints the position if it finds the string as below,

as you see in this example we found the first “String” that is at the position 5 which means starts from the 6th character ‘S’ of this string.

How to search a string from a given position of a string?

The find() method is a String Method that finds a string in its string . There can be a position to start as a second parameter, search begins from this position to the end of string. find() method returns the position of the first character of the found substring. If no such substring is found in that string then it returns npos of the string (std::string::npos).

Syntax:

This full C++ example below shows how we can find a string in another string by using find() method,

Output of this code will print the original string and prints the position if it finds the string as below,

as you see in this example we found the second “String” by using search start position at 6. Result is at the position 17 which means starts from the 18th character ‘S’ of this string.

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About author

33+ years of coding with more than 30+ programming languages, mostly C++ on Windows, Android, Mac-OS, iOS, Linux and some other operating systems. Dr. Yilmaz Yoru was born in 1974, Eskisehir-Turkey. He graduated from the department of Mechanical Engineering of Eskisehir Osmangazi University in 1997. One year later he started to work in the same university as an assistant. He received his MSc and PhD degrees from the same department of the same university. He has married and he is a father of a son. Some of his interests are Programming, Thermodynamics, Fluid Mechanics and Artificial Intelligence. He also likes the graphical 2D & 3D design and high-end innovations.
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