C++ :: STL Regex Get Position Of Match Within String

Apr 18, 2013

I am trying to get the position of the matches of "Un" in string "Unseen University" in c++ code using STL regex. How can I do this.

i.e. I have following:

std::vector<std::cmatch*>* matches = new std::vector<std::cmatch*>*;
intMyReturnVal = regex("Unseen University", "Un", matches);

I can access a match by

matches->at(i)

and get an Iterator to the beginning of the match by

matches->at(i)->begin()

How can I get the relative position of the match within the entire target string (i.e. "Unseen University", where, in this case, the positions should be 0 and 7)??

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C++ :: How To Find Position Of First String In Input That Matches Regex

Oct 18, 2014

i want to find the position of the first string in input.txt that matches a regex

// Input.txt
[A-Z]o
Hello everyone, i am John It is rainy today

// Here is my code

string temp; // Store "Hello everyone, i am John
//It is rainy today"
temp.resize(500);
char REGEX[500];
FILE *fi;

[Code]....

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C++ ::  STL Regex To Match Multiple Substrings

Apr 17, 2013

I am using the (fairly) new STL implementation, which I just became aware of, of regexes. Seems to be an implementation of boost::regex Anyway, I have code, which I would like to use to get ALL matches within a string.

My String is: "Unseen University - Ankh-Morpork"

My regex is (simply): "Un" ;)

using code:

const char *reg_esp = "Un";
std::regex rgx(reg_esp);
std::cmatch matches;
const char *target = "Unseen University - Ankh-Morpork";

[Code] .....

gives output:

"Un" (one line only). How do I get this to match ALL instances of "Un" (i.e. that the output is "UnUn", i.e Un two times)?

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C# :: How To Match Regex If Input Was Array Of Strings

May 19, 2014

In the MSDN, it gives an example using Regex.Matches method:

using System;
using System.Text.RegularExpressions;
public class Example {
public static void Main() {
string pattern = "a*";
string input = "abaabb";
foreach (Match m in Regex.Matches(input, pattern))
Console.WriteLine("'{0}' found at index {1}.",
m.Value, m.Index);

[code]......

I am wondering if string input was an array of strings instead, how would I use Regex.Matches?

What I was thinking about doing is having the input array set to ToString(), input.ToString(), but that doesn't seem to work.

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C# :: Split String With Regex

Aug 27, 2014

I have the the following two strings:

D 1069 Dresden - Neustadt
01069 Dresden - Neustadt

I want to splitt the string and the result should be in both cases:

1069
Dresden - Neustadt

How could i do this with regular expression?

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C++ :: Comparing Char And Int - Output Match Or Does Not Match

Feb 21, 2013

My program compiles fine and doesn't have any errors so I am confused as to what the issue might be.

I have a int, which is determined by the user via cin.

I have a char, which is a random word generated from an input file.

1. I want the program to display "The word you entered does match..." if the word entered by the user is the same as the random word.

2. I want the program to display "The word you entered does not match..." if the word entered by the user is not the same as the random word.

The code I'm using for number one is
if (char == "int") cout << "does match..."

The code I'm using for number two is
else if (char != "int") cout << "does not match..."

Basically the programs only outputs "does not match" whether or not it really matches. Even if it matches, it outputs does not match.

Is something wrong with my code?

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C++ :: Multiply String To Int - Could Not Find Match Operator

Jan 5, 2015

Whats wrong with my program ? It always says that coundn't find match operator ? What can i do ? I want to multiply string pay to int HOURS.

#include<iostream>
#include<fstream>
#include<string>
using namespace std;
int main () {
system("color 8e");
string ID,name, address,No, pos ,pay, hanap;
string hours;

[Code] .....

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C++ :: How To Find Position Of Certain Character In String

Jan 11, 2013

I need to find position of certain character in string, so i made a function but it doesn't do what i thought it would.

Consider this string:

std::string line = "<foo> <foo> <foo> <foo> <foo>"

I need to find position of a third '>' character so i can get:

std::string other = "<foo> <foo> <foo>";

This is my function that fails:

std::size_t find_third(const std::string& line) {
std::size_t pos = 0u;
for(std::size_t i = 0; i < 3u; ++i) {
std::string tmp = line.substr(pos);
pos = tmp.find_first_of('>');
} return pos;
}

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Visual C++ :: Reading Character Symbols On Lines Of Text Position By Position?

Mar 4, 2013

What I have to do is write a small program in C++ to parse the symbols that are used on 5 different lines of text in each position until position 30 is reached on each line. The goal of the parsing program is to interpret the symbols (characters), if there are any per each position, on the 5 lines of text in order to output the actual data that the group of symbols represents.

My question for is this: Is there anything special from a C++ environment that should go in to something like this outside of using standard stuff like the math associated with the search algorithm that has to happen here? The symbols are located in a file, so I know I have to include "iostream" and a few other headers. But outside of header inclusions and the code necessary to iterate and streamline the search and interpretation process, am I missing anything special that I couldn't otherwise find through simple google searches?

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C++ :: How To Use Regex Library To Use It In CLI Game

Jan 18, 2015

I want to use C++ regex library, to use it in my lil' CLI game. The aim is to create the template(not C++ template :)) for command(like "go north"). Then, if player writes anything that contains "go", and "north" appearing after that(examples: "go north" "please go north" "Let's go north!" "Princess, I insist that we go to the north") would all be interpreted as simple "go north". I have used a bit of regex in Linux system, but not this ECMAScript regex that C++ uses.I've checked in some online regex tester, that if I write: ".*go.*north.*" then anything I want will be matched; however, I'd like these to be specifically separated by space(the rule is: between north and go there must be at least one character: a space, so that gornorth won't be interpreted as command.).

Bonus points: if it's possible to do that without some kind of black magic, I'd like to achieve following goals:

1)Before go, there can be any amount of characters, but if there is 1 or more characters, the character just before go must be space.
2)In between go and north, there must be at least one character, space. If there are more, then characters right after go and just before north have to be spaces.

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C++ :: Searching A MultiMap With Regex

Apr 24, 2014

I have a multimap with over 300k entries defined like so: std::multimap<std::string, std::string> filedata;

Using the following code and std::multimap::equal_range, I am able to successfully search for a word in the multimap and get needed data:

// Data with strings.
data = std::vector<std::string>();
// Get iterators to matched pairs.
std::pair <std::multimap<std::string, std::string>::iterator, std::multimap<std::string, std::string>::iterator> dat = filedata.equal_range(word);
// Go through each matched pair and get needed info.
for (std::multimap<std::string, std::string>::iterator iter = dat.first; iter != dat.second; iter++) {
data.push_back(iter->second);
}

Now, I would like to search the multimap using regular expressions (EX: std::regex("[a-z][a-e]h")). What is the fastest way to do this? Example code may look like:

std::pair <std::multimap<std::string, std::string>::iterator, std::multimap<std::string, std::string>::iterator> dat = filedata.equal_range_with_regex(std::regex("" + word + ""));. Pseudo-code / algorithms will be enough.

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C/C++ :: Regex - Get Word With Separator

Nov 23, 2014

string skirt = "[\s,.;:!?()\-]+";
regex re(skirt);
sregex_token_iterator it(begin(), end(), re, -1);
sregex_token_iterator reg_end;
for(; it != reg_end; ++it) {
string zodis = it->str();
}
}

I use this to get a word from a large text file. But the problem is, if there is :

however,
It prints out now
however,
but
however
without a separator.

How can I fix that?

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C++ :: Sorting From Match Data

May 13, 2014

say I have person 1 to person 1024

Let's say

I want to sort them from smartest to dumbest

I have very few data say

person 1 is smarter than person 23 and so on

There are many missing data

say I don't know if person 30 is smarter or dumber than person 50

How to sort this kind of array ?

I definitely know it can't be sorted but how can I sort this as best as possible.

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C/C++ :: Variables From Different Functions Don't Match

Dec 4, 2014

In the code below there is some error, I think it is related with functions. It compiles properly but then it outputs only : "humanslife8.90145e+032"

#include <iostream>
#include <windows.h>
#include <stdlib.h>
using namespace std;
void userInput(float HumanNumber, float SkeletonNumber, float AllHumanslife, float AllSkeltonslife, float SkeletonHealth, float HumanHealth);
void HumansTurn(int turn, float HumanAttack, float AllSkeletonslife, float HumanNumber, float HumanDamage, float SkeletonHealth, float SkeletonNumber);

[code].....

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C++ :: Use Boost / Regex For Regular Expressions?

Sep 5, 2013

So I need to use boost/regex for regular expressions. someone told me that it needs to be built. the first problem is boost doesn't tell you how to build it and the second is i did sudo apt-get install libboost something. I don't remember the exact name of the package. it installed but i dont know how i would build it when its installed.

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C++ :: Create Map Containing Regex As Key And Char As Attribute

Mar 27, 2013

I want to create a map contaning a regex as key and a char* as an attribute , like:-

map<regex, char*> res;
res["[[:alnum:]]"] = "alphanumeric text";

but the following error is generated:-

vector<pair<regex,string>>res;
res.push_back(make_pair("[[:alnum:]]","alphanumeric"));

but the error generated is:-

no instance of overloaded function "std::vector<_Ty, _Alloc>::push_back [with _Ty=std::pair<std::regex, std::string>, _Alloc=std::allocator<std::pair<std::regex, std::string>>]" matches the argument list
argument types are: (std::pair<const char *, const char *>)
object type is: std::vector<std::pair<std::regex, std::string>, std::allocator<std::pair<std::regex, std::string>>>

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C# :: Regex / Getting Integer As Long As Its Not In Quotes

May 9, 2014

I am trying to highlight integers in a textbox.

The problem, is that I dont know how to make Regex get Integers no matter what (e.g. even if an =, >,<,>=,<= sign is in front or anything) unless it is encased in a string e.g. "'s or whatever.

My current code does this:

I do not want the numbers to be highlighted if they are in a string.

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C++ :: Performing RegEx On Open File

Jan 11, 2013

I'm trying to open a file and perform a regex on it, then print the matches, but I'm not sure if I have it right. I think I need to remove the line -

Code:
[for ( std::vector<TCHAR>::iterator It = buffer.begin();It != buffer.end(); It++ )

since I've already copied the file into the buffer, but how do I search the buffer?

Code:
std::ifstream in(TempFullPath, std::ios::in|std::ios::binary);
if( in.fail() )
{
std::cout << "File does not exist or could not open file";
}

[Code]....

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C++ :: RegEx - Obtain The Alternation Index?

Sep 26, 2014

I was just reviewing some code, and my eye fell on a bit of regex that's intended to parse a date/time stamp into a date and time.

The timestamp uses shorted month names. The regex had all the possible month names to match the entire pattern. If it does, it went through a 2Nd loop to convert the month name into a 1 to 12 numeric value...

This made me wonder, since the regex is already doing the work to verify the alternation, can't it at the same time tell me which of the possible alternations it matched and use that to calculate the numeric value. So basically

Code:
std::regex reMonth("Some more regex stuff here (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec).");
CString strTest("Some more regex stuff here Aug.");
std::cmatch res;
if (std::regex_match(strTest.GetString(), res, reMonth)) {
//int iMonthNum = res[1].something(); // some code here that returns 8 for Aug.
}

Or is there really no other way out than doing a 2nd level verification to figure out the actual month number. (The real regex is a bit more complex than this).

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C++ :: How To Match Two Rows Of Data And Return Only 1 Value

Aug 1, 2013

I've got two columns of data.

Code:
int a[6]={1,3,5,8,10,12};
int b[3]={3,5,9};
int c[6]={0}; if a is equal to ANY of the data in b, then c= a*2
if a isn't equal to any of the data in b, then c=a.

Here is the answer I want

Code:
c[6]={1,6,10,8,10,12}

I tried using two for loop, but it isn't correct.....

Code:
int a[6]={1,3,5,8,10,12};
int b[3]={3,5,9};
int c[6]={0};

for(int i=0;i<6;++i){

[Code] ....

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C :: How To Read In Nine Bytes And Check To See If There Is A Match

Feb 22, 2013

and see if the first three match a list then read in three more behind those that were left and perform a similar test on them and keep going?

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C++ :: Simplest Way To Perform Attribute Match?

Aug 2, 2013

I have a input record like

acct|N|Y|N|N|rose@gmail.com

Now I need to create a logic to append a code to the end of the file using the following matrix rules.

00NNNN
01NNNY
02NNYN
03NNYY
04NYNN
05NYNY
06NYYN
07NYYY

[code].....

In the above example these four flags are "N|Y|N|N", so I need to append the matching code at the end of file "04".

desired output :

acct|N|Y|N|N|rose@gmail.com|04|

as it matches code '04':

04NYNN

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C++ :: Factor Out Data With Different Values To Match To Another Value

Feb 4, 2014

How will you factor out data with different values to match to another value.

For example:

value A=100
value B=50,10,20,5,15,20,30

How will you construct a logic that the values on value B will have an equal value as value A.

100 = 50+20+10+20 or 100 = 50+30+20 and so on and so forth.

I am stuck.

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C++ :: Output Only Few Files Using Regex From Current Directory

Nov 20, 2013

I'm trying to output only a few files, using regex, from the current directory, this is my main code:

Code:
// main.cpp
{
char * _dir = new char[MAX_PATH];
getcwd(_dir, MAX_PATH);
unique_ptr<CExtractor> _ptr(new CExtractor(_dir));
delete[] _dir;
}

Code:
// CExtractor.cpp
DIR *pdir = NULL;
struct dirent *pent = NULL;
pdir = opendir(_cwd.c_str());
while ((pent = readdir(pdir)) && (pent->d_type != DT_DIR)) {
if (regex_match(pent->d_name, regex(".(in|txt)$"), std::regex_constants::icase)) {
cout << pent->d_name << endl;
}
}
closedir(pdir);

My code is compiled correctly, but when I run my binary, nothings is outputed..here are my files in the current directpory:

aclocal.m4 config.guess config.status depcomp m4 NEWS
AUTHORS config.h config.sub INSTALL Makefile README
autom4te.cache config.h.in configure install-sh Makefile.am src
ChangeLog config.h.in~ configure.ac libtool Makefile.in stamp-h1
compile config.log COPYING ltmain.sh missing

I have a few "in" files

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C :: Simple Regex To Find Word But Not Containing Some Other Words

Sep 13, 2013

I've been trying to do a RegEx, but I just can't seem to find the solution for it.

Do the following to find Test:

Test55: Will be allowed
TestABC: Will NOT be allowed

Basically, if Test is followed immediately by anything else other than a case-insensitive letter (not [a-zA-Z]), then it will pass.

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C++ :: Regex Unexpected Matching (Floating Point)

Oct 28, 2014

I have written this regex to match a floating point literal:

(^[[:space:]]*)(([0-9]+.?[0-9]*([eE][+-]?[0-9]+)?)|"
"(.[0-9]+([eE][+-]?[0-9]+)?))([fFdD]?[[:space:]]*)$

and when I match it with string like "123e" or "e2" it works while it shouldn't and I can't find the reason why.

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