CODEWITHSUNDEEP
c++
venkysmarty
venkysmarty

Reputation: 11431

Parsing a C++ string in C++

I have a requirement like this: I have a string like "-myArg:ArgVal".

std::string strArg = "-myArg:ArgVal";

Now, I have to check in above string first character is always '-' and if first character is '-' i should remove it and i should store "myArg" and "ArgVal" in two different string objects.

How can I do this efficiently?

Upvotes: 0

Views: 235

Answers (4)

Exa
Exa

Reputation: 4110

std::string has the functions you need. You can check the first char by using string::at and create substrings with string::substr. Erasing single chars works the same comfortable way.

See a c++ reference for more information.

Upvotes: 0

ognian
ognian

Reputation: 11541

The most scalable and solid way is via regular expressions. Recommended library is Boost.Regex

Upvotes: 1

Alexander Gessler
Alexander Gessler

Reputation: 46607

Have a look at std::string::substr() and std::string::find().

Upvotes: 1

qwertymk
qwertymk

Reputation: 35256

Try this

if (strArg[0] == '-') {
    strVar1 = strArg.substr(1, strArg.find(':') - 1);
    strVar2 = strArg.substr(strArg.find(':') + 1);
}

Of course I'm assuming that if the string starts with '-' then there will be a ':' in it with chars before and after. You should probably check this because if there isn't it can cause an error

Upvotes: 3

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