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Solved Regex MatchOffset - Does it work right ?


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Bacardi
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Join Date: Jan 2010
Location: mom's basement
Old 04-16-2022 , 15:59   Regex MatchOffset - Does it work right ?
Reply With Quote #1

About this https://sm.alliedmods.net/new-api/re...ex/MatchOffset
- I'm not sure do I use it right.
Should this return offset of match in string ?
It now return offset of end of match in string.

Below example match STEAM_ id pattern.
output
Code:
sm plugins reload test
"<STEAM_0:1:23456> Baca bacardi jump over brown fox STEAM_7:8:9012345678 rolling down the hill, hit his head on rock"

numofmatch 2
> Baca bacardi jump over brown fox STEAM_7:8:9012345678 rolling down the hill, hit his head on rock
matchoffset 16

 rolling down the hill, hit his head on rock
matchoffset 71

[SM] Plugin test.smx reloaded successfully.


PHP Code:

#include <regex>

Regex rextest;

char loremipsum[] = {
    
"<STEAM_0:1:23456> Baca bacardi jump over brown fox \
    STEAM_7:8:9012345678 rolling down the hill, hit his head on rock"
}


public 
void OnPluginStart()
{
    
rextest = new Regex("(STEAM_\\d:\\d:\\d+)");

    
int numofmatch rextest.MatchAll(loremipsum);
    
int matchoffset;

    if(
numofmatch 0)
    {
        
PrintToServer("\"%s\"\n"loremipsum);

        
PrintToServer("numofmatch %i"numofmatch);

        for(
int a 1numofmatcha++)
        {
            for(
int b 0rextest.CaptureCount(a); b++)
            {
                
matchoffset rextest.MatchOffset(b);
                
PrintToServer("%s"loremipsum[matchoffset]);
                
PrintToServer("matchoffset %i\n"matchoffset);
            }
        }
    }


Last edited by Bacardi; 04-21-2022 at 12:11.
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Dragokas
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Join Date: Nov 2017
Location: Ukraine
Old 04-19-2022 , 10:09   Re: Regex MatchOffset - Does it work right ?
Reply With Quote #2

Likes a bug.

However, your double-cycle is a bit strange.
Here is more clear test:
PHP Code:
#pragma semicolon 1
#pragma newdecls required

#include <sourcemod>
#include <regex>

Regex regex;

char loremipsum[] = {
    
"<STEAM_0:1:23456> Baca bacardi jump over brown fox \
    STEAM_7:8:9012345678 rolling down the hill, hit his head on rock"
};

public 
void OnPluginStart()
{
    
char buf[128];
    
regex = new Regex("STEAM_\\d:\\d:\\d+");
    
    
int numMatches regex.MatchAll(loremipsum);
    if( 
numMatches )
    {
        
PrintToServer("Full string: \"%s\"\n"loremipsum);
        
PrintToServer("Num of matches: %i\n"numMatches);

        for(
int iMatch 0iMatch numMatchesiMatch ++)
        {
            
int offsetMatch regex.MatchOffset(iMatch);
            
regex.GetSubString(0bufsizeof(buf), iMatch);
            
            
PrintToServer("[substring:%i, offs:%i, len:%i]: %s"iMatchoffsetMatchstrlen(buf), buf);
        }
    }

Quote:
Full string: "<STEAM_0:1:23456> Baca bacardi jump over brown fox STEAM_7:8:9012345678 rolling down the hill, hit his head on rock"

Num of matches: 2

[substring:0, offs:16, len:15]: STEAM_0:1:23456
[substring:1, offs:71, len:20]: STEAM_7:8:9012345678
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Last edited by Dragokas; 04-19-2022 at 10:16.
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Bacardi
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Old 04-19-2022 , 12:12   Re: Regex MatchOffset - Does it work right ?
Reply With Quote #3

Quote:
Originally Posted by Dragokas View Post
Likes a bug.

However, your double-cycle is a bit strange.
Here is more clear test:
It's from previous practising code, looking log outputs.
https://regex101.com/r/OESJ0R/1

Using Capturing Group ()
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Dragokas
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Join Date: Nov 2017
Location: Ukraine
Old 04-19-2022 , 13:38   Re: Regex MatchOffset - Does it work right ?
Reply With Quote #4

Yeah, but, in such case it should be rextest.MatchOffset(a) in your code, because MatchOffset is accepting index of match, not index of capture.
Index of capture can be used with GetSubString (argument str_id) as according to docs.
One match can contain several captures. The capture is a part enclosed in parentheses. If you would have several enclosed parts in expression e.g. "(STEAM_)(\\d:\\d:\\d+)", so you'll have several captures in each match.
Anyway, it doesn't change that the result offset is a bugged value. It should point to the start of a string index where match was found.
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Last edited by Dragokas; 04-19-2022 at 13:41.
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Bacardi
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Old 04-19-2022 , 18:22   Re: Regex MatchOffset - Does it work right ?
Reply With Quote #5

Aaa ok, I got confused with matches and captures. I need practise those again.
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asherkin
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Old 04-21-2022 , 10:22   Re: Regex MatchOffset - Does it work right ?
Reply With Quote #6

The docs aren't the best, but it is for implementing MatchAll yourself - it gives you the offset to start searching for the next match from. It's too late to change the implementation I think.
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Bacardi
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Old 04-21-2022 , 12:10   Re: Regex MatchOffset - Does it work right ?
Reply With Quote #7

Thaw would make sense.

By reducing offset with strlen of match string, can get matching start offset.
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