How do I check to see if my string contains spaces using preg_match?

Question

i use this code in php to detect if the string contains characters other than a-z,A-Z,0-9. I want to check if the string contains any spaces. What should I add to the pattern?

if (preg_match ('/[^a-zA-Z0-9]/i', $getmail)) {
    // The string contains characters other than a-z and A-Z and 0-9
}

Answer 1

if (preg_match('/[^a-z0-9 ]/i', $getmail)) // The string contains characters other than a-z (case insensitive), 0-9 and space

Note I removed A-Z from the character class too as you have case insensitivity turned on.

Answer 2

If you want to add space to your current pattern, you actually need to input space in your pattern:

/[^a-z0-9 ]/i
         ^
      Notice the space there

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Answer 3

You can try this

/[^a-z0-9\s]/i

As you used the i modifier no need for A-Z. The \s part will mean spaces, but also tabs or any white space.