This community-built FAQ covers the “Sanitizing for Back-end Storage” exercise from the lesson “Introduction to PHP Form Validation”.
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FAQs on the exercise Sanitizing for Back-end Storage
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I’m a bit confused about structure of the pattern in the example as well as in the instructions.
It comes like this: preg_replace("/[^0-9]/", “”, $number);
Why should one use the forward slashes here? They were not necassary before, as far as I remember. And when I dont use them (just “[^0-9]”), then it seems to work just as fine.
Thanks for any help!
Welcome to the forums, @java8805287390.
The forward slashes denote the RegularExpression data type. It helps to parse it out of the string object. Regexs are not strings. We also need the slashes if we wish to afix any flags such as g or i.
As for it working without the slashes, test this on a hard refresh before drawing any conclusions. Let us know what happens, either way.
Oh, I see. Thanks for the fast answer!
And of course, without the forward slashes it didnt work