I am trying to use regex to check if a user name is considered valid. For a user name to be valid it must be between 2 and 10 characters long. It must start with a lower case letter and it must be made up of only lowercase letters, upper case letters or digits.
Here is what I have so far
return preg_match("/^[a-z]([a-zA-Z0-9]{2,10})$/", $name);
For consistency, your capture expression should include your whole username (in your case you are skipping the first letter). You've also noticed you only need to use {1,9}
for the second half:
^([a-z]{1}[a-zA-Z\d]{1,9})$
a-zA-Z0-9
s afterwards, and capturing the whole username. Modifiers (if required): mg
(multi-line, match-all [for when testing with a block of multiple lines])
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