QT中字串的比較 查詢 替換等操作

基本操作

qstring s1 = "welcome";

qstring s2;
s2 = s1 + "to you";
qstring s3 = "hello ";
s3 = s3 + "world";
qdebug() << s2 << endl << s3 << endl;
qstring s4 = "hello";
qdebug() << s4 << endl;
qstring s5;
s5.sprintf("%s","welcome to my world");
qdebug() << s5 << endl;
qstring s6;
s6 = qstring("i'm %1 %2").arg("is").arg("marco");
qdebug() << s6 << endl;

插入

//任意位置

qstring s7("marco  good");
s7.insert(6,"is");
qdebug() << s7 << endl;
//開頭
qstring s8(" is good");
s8.prepend("marco");
qdebug() << s8 << endl;

替換

qstring s9("marco is bad");

s9.replace("bad","good");
qdebug() << s9 << endl;

移除字串兩端空白

qstring s10("      marco is good    ");

s10 = s10.trimmed();
qdebug() << s10 << endl;

移除字串兩端空白並新增乙個空白符

qstring s11("      marco is good    ");

s11 = s11.simplified();
qdebug() << s11 << endl;

查詢字串內容

//查詢字串開頭

qstring s12("welcome to you");
qdebug() << s12.startswith("welcome",qt::casesensitive) << " "
<< s12.startswith("welcome",qt::caseinsensitive) << endl;//true
//查詢字串結尾
qdebug() << s12.endswith("you",qt::casesensitive) << " "
<< s12.endswith("you",qt::caseinsensitive) << endl;//true
//遍歷整個字串判斷內容是否出現過
qdebug() << s12.contains("to",qt::casesensitive) << " "
<< s12.contains("to",qt::caseinsensitive) << endl;

比較

//localeawarecompare(const qstring& ,const qstring &)靜態成員函式

//比較兩個字串如果前者小於後者返回負整值，等於返回0，大於返回正整數
if(qstring::localeawarecompare(s11,s12) < 0)
qdebug() << "s11 < s12" << endl;
else if(qstring::localeawarecompare(s11,s12) > 0)
qdebug() << "s11 > s12" << endl;
else if(qstring::localeawarecompare(s11,s12) == 0)
qdebug() << "s11 == s12" << endl;
//compare()//該函式可指定是否區分大小寫比較，其他跟localeawarecompare()類似
if(qstring::compare(s11,s12,qt::casesensitive) < 0)
qdebug() << "s11 < s12" << endl;
else if(qstring::compare(s11,s12,qt::casesensitive) > 0)
qdebug() << "s11 > s12" << endl;
else if(qstring::compare(s11,s12,qt::casesensitive) == 0)
qdebug() << "s11 == s12" << endl;

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