c++字符串批量替换

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void Replace()
{
	offindex = s1.find("wbm",0);
	while( offindex != string::npos )
	{
		cout<<"offindex:"<<offindex<<endl;
		s1.replace(offindex,3,"WBM");
		offindex +=1;
		offindex = s1.find("wbm",offindex);
	}
	cout<<s1<<endl;
}