How to filter(startWith()) ?

sonichy

Filter lines startWith "#include";

QStringList list = textEdit->toPlainText().split("\n");
QStringList result;
result = list.filter(list.at(i).startWith("#include"));

Prince_0912

Hi @sonichy ,
list.filter(list.at(i).startWith("#include")); is return bool value so it is not convert bool to QString type.

this below is helpful to you,
bool QString::startsWith(const QString &s, Qt::CaseSensitivity cs = Qt::CaseSensitive) const

thank you.

KillerSmath

@sonichy said in How to filter(startWith()) ?:

Filter lines startWith "#include";

QStringList list = textEdit->toPlainText().split("\n");
QStringList result;
result = list.filter(list.at(i).startWith("#include"));

You can use a regular expression to find all strings starting with #include

#include <QStringList>
#include <QRegExp>

...

  QStringList result;
  result = list.filter(QRegExp("^#include.*"));

...

jsulm

@sonichy Use a regular expression:

result = list.filter(QRegularExpression("^#include.*"));

SGaist

Hi,

Please use QRegularExpression, QRegExp is to be considered deprecated with Qt 5.

VRonin

Or if you are a parallel hipster:

Using Qt:

QStringList list = textEdit->toPlainText().split("\n");
QStringList result = QtConcurrent::blockingFiltered(list , [](const QString& val)->bool{return val.startWith(QLatin1String("#include"));});

using C++17:

QStringList list = textEdit->toPlainText().split("\n");
QStringList result;
std::copy_if(std::execution::par,list.cbegin(), list.cend(), std::back_inserter(result), [](const QString& val)->bool{return val.startWith(QLatin1String("#include"));});