I wrote a regex in RegExr to tackle the following string:
<?php _on*/4353452f43f43f46 xx46 _off*/ ?>
This is the Regex code:
(.*<?php.*)(.*_on.*)(.*_off.*)(.*?>)
Which is working fine here:
http://regexr.com?31ptt
But it doesn't work with PHP, I get weird errors like: "Unknown modifier '<'", etc.
What do I need to do to convert this to work with PHP?
This is my php code:
$virusstring = '(.*/<?php.*)(.*_on.*)(.*_off.*)(.*?>)';
if(preg_match($virusstring,$myfile)) {
$fixed = preg_replace($virusstring,'',$myfile);
$blah = file_put_contents($item, $fixed);
}
$myfile is just taken from the infected file that is being scanned.
Your regular expression is missing delimiters. You need to add delimiters or PHP will assume your opening ( is a delimiter:
/(.*<\?php.*)(.*_on.*)(.*_off.*)(.*\?>)/
Also, ? is a quantifier, matching 0 or 1 of the previous character. You need to escape it:
(.*<\?php.*)(.*_on.*)(.*_off.*)(.*\?>)
This seems to work fine
preg_match("/(.*<\\?php.*)(.*_on.*)(.*_off.*)(.*\\?>)/us", $searchText)
Related
I'm trying to check if a string ends with one _ and two letters on an old system with php. I've check here on stackoverflow for answers and I found one that wanted to do the same but with one . and two digits.
I tried to change it to work with my needs, and I got this:
\\.*\\_\\a{2,2}$
Then I went to php and tried this:
$regex = '(\\.*\\_\\a{2,2}$)';
echo preg_match($regex, $key);
But this always returns an error, saying the following:
preg_match(): Delimiter must not be alphanumeric or backslash
I get this happens because I can't use the backslashes or something, how can I do this correctly? And also, is my regex correct(I don't know ho to form this expressions and how they work)?
You can use this regex with delimiters:
$regex = '/_[a-z]{2}$/i';
You're getting that error because in PHP every regex needs a delimiter (not use of / above which can be any other character like ~ also).
^.*_[a-zA-Z]{2}$
This should do it for you.
$re = "/^.*_[a-zA-Z]{2}$/";
$str = "abc_ac";
preg_match($re, $str);
i have this regex string that i got from a website to pull emails from a file:
(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")#(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])
Ive tested it in regex buddy ( regex testing software ) and it works!
when i copy and paste the regex from regex buddy to my php file, i have to escape 2 " characters to make the regex form a valid string in php.
in php i use it like this:
$file = file_get_contents(/* URL TO GET */);
$email_pattern = "(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*\")#(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])";
$matches = array();
if ( preg_match_all ( $email_pattern, $file, $matches ))
{
echo print_r($matches, true);
}
but i get this warning!?!?
Warning: preg_match_all() [function.preg-match-all]: Unknown modifier '#'
however this regex works in regex buddy?
Where am i going wrong???
2 things:
step 1:
You need to put delimiters ( the / before and after the regex, so that you may add modifier ):
$email_pattern = "/(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|\"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*\")#(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])/";
step2:
And as your in a PHP string, you'll need to escape all the special character ( like \ that must become \\ , and $ that would become \$ , etc... )
So the escape to include the regex in a PHP String should look like this:
(?:[a-z0-9!#$%&\'*+/=?^_`{|}~-]+(?:\\.[a-z0-9!#$%&\'*+/=?^_`{|}~-]+)*|\\\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\\\")#(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])
And you also have to escape /, as we use that caracter for the delimiter of the first step. So we need the regex to see \/, but as we express the regex in a php string, we will replace / by \\/
If I'm right -- usually I use regex buddy too to do the conversion with the PHP export tool, but now I don't have it so I've done it by hand-- it should give something LIKE this:
$email_pattern = '/(?:[a-z0-9!#$%&\'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&\'*+\/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")#(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])/';
I would also suggest that you put the string inside single quote.
I tried and...
Single quotes will give an error...
Use double quotes and the {} as delimiters // gives an error also
I'm having this issue with a regular expression in PHP that I can't seem to crack. I've spent hours searching to find out how to get it to work, but nothing seems to have the desired effect.
I have a file that contains lines similar to the one below:
Total','"127','004"','"118','116"','"129','754"','"126','184"','"129','778"','"128','341"','"127','477"','0','0','0','0','0','0
These lines are inserted into INSERT queries. The problem is that values like "127','004" are actually supposed to be 127,004, or without any formatting: 127004. The latter is the actual value I need to insert into the database table, so I figured I'd use preg_replace() to detect values like "127','004" and replace them with 127004.
I played around with a Regular Expression designer and found that I could use the following to get my desired results:
Regular Expression
"(\d+)','(\d{3})"
Replace Expression
$1$2
The line on the top of this post would end up like this: (which is what I am after)
Total','127004','118116','129754','126184','129778','128341','127477','0','0','0','0','0','0
This, however, does not work in PHP. Nothing is being replaced at all.
The code I am using is:
$line = preg_replace("\"(\d+)','(\d{3})\"", '$1$2', $line);
Any help would be greatly appreciated!
There are no delimiters in your regex. Delimiters are required in order for PHP to know what is the pattern to match and what is a pattern modifier (e.g. i - case-insensitive, U - ungreedy, ...). Use a character that doesn't occur in your pattern, typically you'll see a slash '/' used.
Try this:
$line = preg_replace("/\"(\d+)','(\d{3})\"/", '$1$2', $line);
You forgot to wrap your regular expression in front-slashes. Try this instead:
"/\"(\d+)','(\d{3})\"/"
use preg_replace("#\"(\d+)','(\d+)\"#", '$1$2', $s); instead of yours
I want to match matching tags like <tag>...</tag>. I tried the regex
~<([^>]+)>.*?</\1>~
but this fails. The expression worked when I used the exact text inside the angle brackets, i.e,
~<(tag)>.*?</tag>~
works, but even
~<(tag)>.*?</\1>~
fails.
I'm assuming that the back reference is not working here.
Can someone help me out please. Thanks
PS: I'm not using this to parse HTML. I know I shouldn't.
You didn't show your PHP code, but I surmise you have your regex in double quotes. If so then the backreference \1 actually is converted into an ASCII character ☺ before it reaches PCRE. (All \123 sequences are interpreted as C-string octal escapes there.)
It worked for me...
$str = '<a></a>';
var_dump(preg_match('~<([^>]+)>.*?</\1>~', $str)); // int(1)
CodePad.
Also, have you considered an XML parser? Otherwise it won't like a piece of HTML like this...
<a title="Is 4 > 6?"></a>
CodePad.
Apart from the fact that it's not always a good idea to try and match markup languages using regex, your regex looks OK. Maybe you're using it wrong?
if (preg_match('~<([^>]+)>.*?</\1>~', $subject, $regs)) {
$result = $regs[0];
} else {
$result = "";
}
should work.
Use single quotes in the pattern
preg_match_all('/(sens|respons)e and \1ibility/', "sense and sensibility", $matches);
print_r($matches);
I've been trying to use grubers latest url matching regex in a php project.
To test it I threw together something very simple:
$regex = "(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:"'.,<>?«»“”‘’]))";
$array = pret_match_all($regex, $theblockofurltext);
print_r($array);
The first problem was the " would escape a string, depending which I wrapped the regex with, so I just removed it. The use of this is personal and I will never have " anywhere near a url anyway. This left me with a new regex.
$regex = "(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'.,<>?«»“”‘’]))";
Raring to go I then ran my little script and it gave me the following error:
Warning: preg_split() [function.preg-split]: Unknown modifier '\' in D:\wwwroot\xxx\index.php on line 14
Unfortunately my REGEX class at school wasn't taught to anywhere near the levels of this regex requires, and I have no idea where to begin fixing this for use with PHP. Any help would be greatly appreciated. No doubt I'm probably doing something stupid too, so please go easy on me :)
Jon
Add # before and after your RE.
$regex = "#(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:'.,<>?«»“”‘’]))#";
If you use PCRE, the regular expression must be enclosed in delimiters. Now, parenthesis () can also be delimiters, that is why the engine thinks, your expression is only (?i) and interprets the next \ as modifier.
You could use ~ as delimiter:
$regex = "~(?i)\b...]))~";
Update:
I don't know whether PHP supports the partial modifying of an expression with (?i). So you might have to remove this and put the modifier after the delimiter instead (you apply it to the whole expression anyway):
$regex = "~\b...]))~i";