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wildcard.cpp
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wildcard.cpp
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/*
Given two strings where first string may contain wild card characters and second string is a
normal string. Write a function that returns true if the two strings match.
The following are allowed wild card characters in first string.
* --> Matches with 0 or more instances of any character or set of characters.
? --> Matches with any one character.
*/
#include <iostream>
using namespace std;
bool wildCard(const string & regexp, const string & matchStr, int reIndex, int strIndex){
if (strIndex == matchStr.length()) {
return reIndex == regexp.length();
}
if (reIndex == regexp.length()) {
return strIndex == matchStr.length();
}
if (regexp[reIndex] == matchStr[strIndex]) {
return wildCard(regexp, matchStr, reIndex+1, strIndex+1);
} else if (regexp[reIndex] == '*') {
return wildCard(regexp, matchStr, reIndex, strIndex+1) ||
wildCard(regexp, matchStr, reIndex+1, strIndex+1);
} else if (regexp[reIndex] == '?') {
return wildCard(regexp, matchStr, reIndex+1,strIndex+1);
}
return false;
}
int main() {
cout<<wildCard("t*e","treehouse",0,0)<<endl;
cout<<wildCard("t?e","treehouse",0,0)<<endl;
cout<<wildCard("t*s","treehouse",0,0)<<endl;
cout<<wildCard("t*ez","treehouse",0,0)<<endl;
cout<<wildCard("treehouse","treehouse",0,0)<<endl;
cout<<wildCard("tr?eh*","treehouse",0,0)<<endl;
cout<<wildCard("*", "treehouse",0,0)<<endl;
cout<<wildCard("?","treehouse",0,0)<<endl;
}