Count occurrences with regex

[Geates]

Currently, I am using a foreach() loop to count the occurrences of numbers in a string...and to count uppercase letters...and to count lowercase letter...and to count special chars. I feel like there is a "simpler" to do it with regex. Is there?

$n = 0;
$string_as_array = str_split("12sCdf@5sd78%");
foreach($string_as_array as $char) {
	if (is_numeric($char)) {
		$n += 1;
	}
}

-Geates

 

[feherke]

Hi

I would probably prefer it this way :

[COLOR=orange]preg_match_all[/color][teal]([/teal][i][green]'/(?<digit>\d+)|(?<upper>[A-Z]+)|(?<lower>[a-z]+)|(?<special>[@#$%&]+)/'[/green][/i][teal],[/teal] [i][green]'12sCdf@5sd78%'[/green][/i][teal],[/teal] [navy]$match[/navy][teal]);[/teal]

[b]foreach[/b] [teal]([[/teal][i][green]'digit'[/green][/i][teal],[/teal] [i][green]'upper'[/green][/i][teal],[/teal] [i][green]'lower'[/green][/i][teal],[/teal] [i][green]'special'[/green][/i][teal]][/teal] [b]as[/b] [navy]$type[/navy][teal])[/teal]
    [b]echo[/b] [i][green]"found "[/green][/i][teal],[/teal] [COLOR=orange]strlen[/color][teal]([/teal][COLOR=orange]implode[/color][teal]([/teal][navy]$match[/navy][teal][[/teal][navy]$type[/navy][teal]])),[/teal] [i][green]" $type characters\n"[/green][/i][teal];[/teal]

I wrote "probably", because may depend on your goal. To me it looks like kind of password checker, so maybe could become something like this :

[b]function[/b] [COLOR=orange]check[/color][teal]([/teal][navy]$password[/navy][teal],[/teal] [navy]$requirement[/navy][teal])[/teal]
[teal]{[/teal]
    [COLOR=orange]preg_match_all[/color][teal]([/teal][i][green]'/(?<digit>\d+)|(?<upper>[A-Z]+)|(?<lower>[a-z]+)|(?<special>[@#$%&]+)/'[/green][/i][teal],[/teal] [navy]$password[/navy][teal],[/teal] [navy]$match[/navy][teal]);[/teal]

    [navy]$error[/navy] [teal]= [];[/teal]
    [b]foreach[/b] [teal]([/teal][navy]$requirement[/navy] [b]as[/b] [navy]$type[/navy] [teal]=>[/teal] [navy]$count[/navy][teal]) {[/teal]
        [navy]$found[/navy] [teal]=[/teal] [COLOR=orange]strlen[/color][teal]([/teal][COLOR=orange]implode[/color][teal]([/teal][navy]$match[/navy][teal][[/teal][navy]$type[/navy][teal]]));[/teal]
        [b]if[/b] [teal]([/teal][navy]$found[/navy] [teal]<[/teal] [navy]$count[/navy][teal])[/teal]
            [navy]$error[/navy][teal][] =[/teal] [i][green]"Insufficient {$type} characters : found only {$found} while {$count} are required"[/green][/i][teal];[/teal]
    [teal]}[/teal]

    [b]return[/b] [navy]$error[/navy][teal];[/teal]
[teal]}[/teal]

[navy]$error_list[/navy] [teal]=[/teal] [COLOR=orange]check[/color][teal]([/teal][i][green]'12sCdf@5sd78%'[/green][/i][teal], [[/teal][i][green]'digit'[/green][/i] [teal]=>[/teal] [purple]3[/purple][teal],[/teal] [i][green]'upper'[/green][/i] [teal]=>[/teal] [purple]2[/purple][teal],[/teal] [i][green]'lower'[/green][/i] [teal]=>[/teal] [purple]2[/purple][teal],[/teal] [i][green]'special'[/green][/i] [teal]=>[/teal] [purple]1[/purple][teal]]);[/teal]

Of course, if the password strength is configurable in your project, you can compose the regular expression dynamically.


Feherke.
feherke.ga

 

[Geates]

Thanks, feherke. I like the cleanliness of you first solution but my complexity is configurable so I'll implement the second solution.

-Geates