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I inherited some php code for a webgame that I am trying to modify. I came across this line, and I can't figure out what it is supposed to be doing. Could someone help me out? $notice is just a regular string.
$notice = preg_replace("#([\S]{60})#i", "\\1 ", $notice);
It will find any continuous sequence of 60 non-whitespace characters in $notice, and insert a space after it:
(..) creates a capture group. Because it's the first group it's referred to as \1 in the replacement string. Because the whole pattern is in the group it's not really needed here.
[..] create a character class, but because it contains only one meta-character, it's not really needed here, either.
\S matches any non-whitespace character
{60} is a quantifier; it means 'repeated 60 times'.
This code is equivalent to:
$notice = preg_replace("#\S{60}#i", "\\0 ", $notice);
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Looking for regex to do the following in php:
Identify if the given string is in the pattern string1_string2_number e.g ph_val_34563, ph_val_296987 etc.
When true, extract the number part.
regex = "^[A-Za-z]+_[A-Za-z]+_(\d+)$"
Assuming that the valid characters for your strings are letters, [A-Za-z]+ says to expect a group of one or more letters. The _ following these character classes says that an _ must follow.
(\d+) says to group, and capture, a set of one or more numbers following the previous expression.
^ says: "begins with"
$ says: "ends with"
You should take a look at a tutorial on regular expressions.
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Not terribly familiar with regex, but I'm guessing it's going to make life much easier for my current need.
I need to validate that a string contains the correct sequence of numbers and letters, so that it always follows the format "AA99999A", where A can be any A-Z character and 9 can be any 0-9 character. Other than exploding the string and validating the characters individually, how would the best way to handle this be?
The result can be a simple true / false as I don't need to specify which characters are incorrect
How about:
preg_match('/^[A-Z]{2}\d{5}[A-Z]$/', $string);
You can try this regex:
'/^[A-Z]{2}\d{5}[A-Z]$/i'
PHP's preg_match will do the trick:
$string_to_be_validated = "AB12345C";
if (preg_match("/\A[A-Z]{2}[0-9]{5}[A-Z]{1}\z/", $string_to_be_validated)) echo "valid";
else echo "invalid";
Here you can find more information on this.
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Need help with regular expression for <!-- A-Za-z0-9 --> where all the uppercase, smallcase and digits are allowed. Need a regular expression to find this chunk including the comment tags (<!-- -->).
[<!\-\-A-Za-z0-9\-\->]
This is a character class and the order doesn't matter in a character class. What will work however:
<!--\s*[A-Za-z0-9]+\s*-->
If you now want to include spaces inside the comment, you can use:
<!--\s*[A-Za-z0-9 ]+\s*-->
I used the \s* in case there are several white spaces between the <!-- and --> and the part to capture.
Use preg_match_all and if you want to make the regex shorter, you can use the i flag. something like this:
preg_match_all('~<!--\s*[a-z0-9]+\s*-->~i', $page, $matches);
This is all I can think of according to your question
#<!--([A-Za-z0-9]*)-->#
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I am trying to build a regular expression for a specific problem but I cannot achieve to do it. I have a structure of a string like this 01422756860-8.
As you can see there is a string of length 13. The first 11 characters should be numbers in the interval of [0-9], the next character is a line(minus) and the last character is again a number. There shouldn be any space in between these characters.
Could anyone please help me to do this? I am going to use this regex in php.
I look forward on your answer.
Thank You.
What's the problem?
/^[0-9]{11}-[0-9]$/
Demo
Autopsy:
^ The string must start here
[0-9]{11} Any digit from 0 to 9 repeated exactly 11 times
- A literal dash
[0-9] Any single digit from 0 to 9
$ The string must end here
This regular expression should do it
\d{11}-\d
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I don't usually use regular expressions, hence my question. I need a regex to match the following:
'{any-string}'.
Any assistance appreciated.
The most simple expression would be:
/{(.*?)}/
If you expect more complex strings (for example, some kind of escape sequence where the { and } characters are allowed within the string) it could be more complex. For instance, with a \ (backslash) escape sequence:
/{((?:\\.|[^}])*)}/
Edit: That's not tested, but the general idea is that the expression will swallow any character following the escape rather than ensuring it isn't the closing brace.
To replace anything in { } with what file_get_contents returns you can do:
$page = file_get_contents('some_file_name or some_url');
$str = '.....{...}....';
$str = preg_replace('/{[^}]*}/',"$page",$str);