RegEx To Validate 4 and 5 Digit Numbers? [closed]

Question

I have this regex :

if(preg_match("@^\d{4}$@", basename($entry, ".php"))) { --do something here-- }

that condition works only for 4 digits number. but I need to validate 4 digits and also 5 digits. how to make it work to validate 5 digits number too? thanks!

* See also Open source RegexBuddy alternatives and Online regex testing for some helpful tools, or RegExp.info for a tutorial. — mario
– mario, Commented Nov 7, 2012 at 16:32

LazyMonkey · Accepted Answer · 2012-11-07 16:28:54Z

6

the braces can take a low and high end of a range so {4,5} should work.

answered Nov 7, 2012 at 16:28

LazyMonkey

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2 Comments

Jason McCreary Over a year ago

+1 for the regular expression explanation. I encourage you to also provide a code sample.

LazyMonkey Over a year ago

Here's something you can run on the command line: php -r '$pattern = "/^\d{4,5}/"; preg_match($pattern, "12345678", $a); print_r($a);'

Jason McCreary · Accepted Answer · 2012-11-07 16:30:49Z

As an alternative to Regular Expressions, consider simpler functions like ctype_digit() and strlen().

$filename = basename($entry, ".php"); $length = strlen($filename); if (($length >= 4 && $length <= 5) && ctype_digit($filename)) { // your code }

Pedro del Sol · Accepted Answer · 2012-11-07 16:29:25Z

2

if(preg_match("@^\d{4,5}$@", basename($entry, ".php"))) { --do something here-- }

answered Nov 7, 2012 at 16:29

Pedro del Sol

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Comments

exussum · Accepted Answer · 2012-11-07 16:29:42Z

instead of

 if(preg_match("@^\d{4}$@", basename($entry, ".php"))) {

use

if(preg_match("@^\d{4,5}$@", basename($entry, ".php"))) {

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