OK this regex will match string like 2aa, a2, 2aaaaaa, aaaa2, aaa2aaaa, 2222a2222-2222-aaaa... in short, mix of alphanumeric characters in a sequence:
preg_match("/(?:\d+[a-z]|[a-z]+\d)[a-z\d]*/i")
now I want to exclude something but I'm stuck, something like this doesn't work
preg_match("/(?!1920x1200|1920x1080)(?:\d+[a-z]|[a-z]+\d)[a-z\d]*/i")
for example the string aaaaa222aaa1920x1200bbbbb1234556789 is still matched but it shouldn't because it contains 1920x1200
any help is appreciated :)
i'm using regex found here for matching alphanum sequences Regex: match only letters WITH numbers
regex test: https://regex101.com/r/vU9aU9/1
Your negative lookahead should have .* in front to allow for 0 or more characters before not-allowed text. Also use anchors in your regex.
regex should be:
preg_match('/^.*?1920x1200.*$(*SKIP)(*F)|(?:\d+[a-z]|[a-z]+\d)[a-z\d]*/im')