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Editorial Team
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Asked: 2026-06-09T01:15:51+00:00

i need to check, if the string in my PHP code contains only a

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i need to check, if the string in my PHP code contains only a specified list of characters. But as some of them might need scape, i just can’t get it to work. I have tried everything, but it just doesen’t work…

The required validation is:

  • 0-9
  • A-Z
  • a-z
  • chars: .%^&()$#@!/-+/

Basicaly, i want to check if there is an unknown ascii character (i don’t know if there is a function to do that already).

My code is like this now:

if(preg_match("/[A-Za-z0-9\.\#\-\+\*\\\/\=\_\%\$\(\)]/", $cmd) === false)

So, all of the chars are special?

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1 Answer

  1. Editorial Team

    You might be missing a * at the end of the regexp. Also you could instead have the set expressed like [\x00-\x7F] (taken from here).

    This should work:

    [\x00-\x7F]*
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