Simple multiline regex in C++

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Hi
I'm trying to return an array of matches using this code:

std::smatch sm;

if (regex_search(content, sm, regex("[.+]")))
{
	for (int i = 1; i < static_cast<int>(sm.size()); i++)
	{
		cout << sm[i] << endl;
	}
}

The string to match comes in this format:

[
	name: bin1
	type: static
	px: 14
	py: 27
	pz: 93
	rx: 45
	ry: 0
	rz: 0
]
[
	name: car1
	type: static
	px: 14
	py: 27
	pz: 93
	rx: 45
	ry: 0
	rz: 0
]

I tried using the regex "/[.+]/s" to allow for multiline, but the compiler keeps complaining about the "[" and "/" symbols being unrecognised. When I double escape them, the error goes away, but the regex returns nothing.

With the code I have at the moment, nothing appears in the console.

What I have tried:

Everything I could think of, so now I'm here

Posted 17-Dec-17 3:49am

User 13204940

Updated 17-Dec-17 8:08am

PIEBALDconsult

v3

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PIEBALDconsult 17-Dec-17 11:35am

Use a BACKSLASH (\) -- not a SLASH (/) -- to escape the BRACKETs.

2 solutions

Solution 2

Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
RegExr: Learn, Build, & Test RegEx[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx:
Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]

Posted 17-Dec-17 8:08am

Patrice T

Comments

[no name] 17-Dec-17 14:22pm

I did actually use RegExr and Debuggex, both worked fine but the regex patterns didn’t work in C++

Patrice T 17-Dec-17 14:57pm

There is more that 1 flavor of regex and language C++ have specific rules for char strings (as you can see in solution 1).

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CPallini · Accepted Answer · 2017-12-17T04:47:00

Try, for instance

C++

#include <iostream>
#include <regex>
using namespace std;
int main()
{
  std::smatch sm;

  string content ="[\nname: bin1\ntype: static\npx: 14\n]\n[\nname: car1\ntype: static\npx: 14\n]";

  while (regex_search(content, sm, regex("\\[([^\\]]+)\\]")))
  {
    cout << sm[1] << endl;
    content = sm.suffix();
  }

}