[abc] A single character of: a, b or c
[^abc] Any single character except: a, b, or c
[a-z] Any single character in the range a-z
[a-zA-Z] Any single character in the range a-z or A-Z
^ Start of line
$ End of line
\A Start of string
\z End of string
. Any single character
\. One "." (literal)
\s Any whitespace character
\S Any non-whitespace character
\d Any digit
\D Any non-digit
\w Any word character (letter, number, underscore)
\W Any non-word character
\b Any word boundary
(...) Capture everything enclosed
(a|b) a or b
a? Zero or one of a
a* Zero or more of a
a+ One or more of a
a{3} Exactly 3 of a
a{3,} 3 or more of a
a{3,6} Between 3 and 6 of a
patternApp := regexp.MustCompile(`^/?([-\w]*)$`)
patternAPI := regexp.MustCompile(`^/api/?([-\w]*)/?[Z0-9]*/?[z0-9]*$`)
patternAsset := regexp.MustCompile(`^/(scripts/([-\w]+).*\.[js]|styles/([-\w]+).*\.[css]|images/)([-\w]+).*$`)
// ^([a-zA-Z0-9]){20}(\.){1}([a-zA-Z0-9]){60}$ <=> NAME(20).VALUE(60)
preg_match( "/^([a-zA-Z0-9]){20}(\.){1}([a-zA-Z0-9]){60}$/", $input )