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@NogDogFeb 25.2021 — #@NogDogFeb 26.2021 — #
So in the original example, it would match an empty string as well as any number of characters allowed by that character class. If you wanted it to only match if _at least one_ character was found, then you would use the
Regular expressions are essentially their own little (and very terse) programming language.https://www.php.net/manual/en/reference.pcre.pattern.syntax.php
What Does This Regex Do ?
Folks,
What is this regex doing ?
[code]
$name = test_input($_POST[“name”]);
if (!preg_match(“/^[a-zA-Z-‘ ]*$/”,$name)) {
$nameErr = “Only letters and white space allowed”;
}
I can understand it is saying you can only type alpha chars small or Capital. [a-zA-Z] but what do all the other part of the code mean ?
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@NogDogFeb 25.2021 — #<i>
</i>/ regex delimiter
^ starting from the very beginning of the string
[a-zA-Z-' ] match on any letter or hyphen or single quote or space
* match zero or more times that preceding character class
$ ending at the very end of the string
/ regex delimiter
0
@NogDogFeb 26.2021 — #*/fo*l/So in the original example, it would match an empty string as well as any number of characters allowed by that character class. If you wanted it to only match if _at least one_ character was found, then you would use the
+*Regular expressions are essentially their own little (and very terse) programming language.