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c++stringstl
Alex B
Alex B

Reputation: 24936

How to do std::string indexof in C++ that returns index of matching string?

I'm looking for a string indexof function from the std namespace that returns an integer of a matching string similar to the java function of the same name. Something like:

std::string word = "bob";
int matchIndex = getAString().indexOf( word );

where getAString() is defined like this:

std::string getAString() { ... }

Upvotes: 24

Views: 135978

Answers (4)

Andrew Hare
Andrew Hare

Reputation: 351506

Try the find function.

Here is the example from the article I linked:

 string str1( "Alpha Beta Gamma Delta" );
 string::size_type loc = str1.find( "Omega", 0 );
 if( loc != string::npos ) {
   cout << "Found Omega at " << loc << endl;
 } else {
   cout << "Didn't find Omega" << endl;
 }

Upvotes: 36

Bill the Lizard
Bill the Lizard

Reputation: 405745

It's not clear from your example what String you're searching for "bob" in, but here's how to search for a substring in C++ using find.

string str1( "Alpha Beta Gamma Delta" );
string::size_type loc = str1.find( "Omega", 0 );

if( loc != string::npos )
{
   cout << "Found Omega at " << loc << endl;
}
else
{
   cout << "Didn't find Omega" << endl;
}

Upvotes: 5

Perchik
Perchik

Reputation: 5620

I'm not exactly sure what your example means, but for the stl string class, look into find and rfind

Upvotes: 1

dirkgently
dirkgently

Reputation: 111130

You are looking for the std::basic_string<> function template:

size_type find(const basic_string& s, size_type pos = 0) const;

This returns the index or std::string::npos if the string is not found.

Upvotes: 6

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