I need a way to match the following pattern:
0hv05d_1a8198c8c430c2333fd6e49863f59f60_d41d8cd98f00b204e9800998ecf8427e_3600_3_25
Explained:
There are 6 sections separated by underscores. First section is always 6 [a-zA-Z0-9] characters. Second and third sections are MD5 hashes, so they will always be 32 [a-zA-Z0-9] characters each. Last 3 sections can only be numbers.
I'm using PHP preg_match() to do this.
Here's the shortest I can make it, based on your (somewhat incomplete) specifications:
preg_match('/[a-z\d]{6}(?:_[a-f\d]{32}){2}(?:_\d+){3}/i', $string);
This will match exactly six instances of a letter or digit; followed by an underscore and 32 hexadecimal digits, twice; followed by an underscore and any number of digits, 3 times. The /i at the end puts it into case-insensitive mode.
You could try:
<?php
$string = '0hv05d_1a8198c8c430c2333fd6e49863f59f60_d41d8cd98f00b204e9800998ecf8427e_3600_3_25';
if (preg_match('/([a-zA-Z0-9]{6})_([a-fA-F0-9]{32})_([a-fA-F0-9]{32})_([0-9]+)_([0-9]+)_([0-9]+)/',$string,$match)) {
print_r( $match );
}
?>
$string = "0hv05d_1a8198c8c430c2333fd6e49863f59f60_d41d8cd98f00b204e9800998ecf8427e_3600_3_25";
if (preg_match('/^([a-z0-9]{6})_([a-f0-9]{32})_([a-f0-9]{32})_([0-9]+)_([0-9]+)_([0-9]+)$/i', $string, $matches))
{
echo "Match!<br />\n";
echo "First: ".$matches[1]."<br />\n";
echo "MD5 hashes: ".$matches[2]. " - ".$matches[3]."<br />\n";
echo "numbers: ".$matches[4]. " - ".$matches[5]. " - ".$matches[6]."<br />\n";
}
notes:
^ at the beginning of the pattern and the $ at the end.Edit- To be more complete you could do this:
if (preg_match('/[a-z0-9]{6}_[a-f0-9]{32}_[a-f0-9]{32}_\d+_\d+_\d+/i', $subject)) {
# Successful match
} else {
# Match attempt failed
}
I also to make it more concise replased [0-9] with the \d class, changed the matching of MD5 to just [a-f0-9], and I also changed [a-zA-Z0-9] to [a-z0-9] and included the /i for case insensitive.
If you really wanted to the expression could also be rewritten as:
/[a-z0-9]{6}(?:_[a-f0-9]{32}){2}(?:_\d+){3}/i
[a-zA-Z0-9]{6}_[a-f0-9]{32}_[a-f0-9]{32}_[0-9]+_[0-9]+_[0-9]+
ref: http://www.php.net/manual/en/reference.pcre.pattern.syntax.php
also, since php using PCRE (Pearl Compatible Regular Expressions) you can use this nifty cheat sheet: http://www.addedbytes.com/cheat-sheets/regular-expressions-cheat-sheet/
Strict, full string matching into capture groups using PCRE syntax and producing a string array. Demo
preg_match(
'/^([a-z\d]{6})_([a-f\d]{32})_([a-f\d]{32})_(\d+)_(\d+)_(\d+)$/',
$string,
$m
);
Strict, full string matching into capture groups using POSIX syntax and producing a string array. Demo
preg_match(
'/^([[:alnum:]]{6})_([[:xdigit:]]{32})_([[:xdigit:]]{32})_([[:digit:]]+)_([[:digit:]]+)_([[:digit:]]+)$/',
$string,
$m
);
Matching by format returning the capture count and producing individual scalar variables (strings and integers). Demo
sscanf(
$string,
'%6[a-z0-9]_%32[a-f0-9]_%32[a-f0-9]_%d_%d_%d',
$one,
$two,
$three,
$four,
$five,
$six
);
Matching by format returning a scalar array (strings and integers). Demo
sscanf(
$string,
'%6[a-z0-9]_%32[a-f0-9]_%32[a-f0-9]_%d_%d_%d',
)
Simple splitting on the delimiter without any validation and producing a string array: Demo
var_export(explode('_', $string));