题目链接
看了大佬的正则表达式解法, 值得学习一下
AcWing 3244. Markdown - 正则表达式解法
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| #include <bits/stdc++.h>
using namespace std;
string patt1("#+");
string patt2("_(.+?)_");
string patt3("\\[(.+?)\\]\\((.+?)\\)");
regex r1(patt1);
regex r2(patt2);
regex r3(patt3);
string deal (string s) {
while(s[0] == ' ') s.erase(s.begin());
s = regex_replace(s, r2, "<em>$1</em>");
s = regex_replace(s, r3, "<a href=\"$2\">$1</a>");
return s;
}
int main() {
string line;
int tap = 0, flag = 1;
while(getline(cin, line)) {
if(line == "") {
if(flag == 0 && tap == 2) {
cout << "</ul>" << endl;
}else if(flag == 0 && tap == 3) cout << "</p>" << endl;
flag = 1;
} else {
stringstream ssin(line);
string s;
ssin >> s;
if(regex_match(s, r1)) {
int a = s.size();
getline(ssin, s);
s = deal(s);
cout << "<h" << a << ">" << s << "</h" << a << ">" << endl;
tap = 1;
} else if(s == "*") {
if(flag) {
cout << "<ul>" << endl;
}
getline(ssin, s);
s = deal(s);
cout << "<li>" << s << "</li>" << endl;
tap = 2;
} else {
if(flag) cout << "<p>";
else cout << endl;
string s2;
getline(ssin, s2);
s = s + s2;
cout << deal(s);
tap = 3;
}
flag = 0;
}
}
if(flag == 0 && tap == 2) cout << "</ul>" << endl;
else if(flag == 0 && tap == 3) cout << "</p>" << endl;
return 0;
}
|
