Tests whether the string starts with an uppercase letter

Decomposes a string into characters. Example: explode "abc" = ["a";"b";"c"]

escape_car c s replaces each occurence of character c in s by its escaped version. Example: escape 'z' "azb" = "a\zb". This function is useful for generating HTML-compatible strings

remove_car c s removes all occurences of character c in s

concat_sep sep [s1;..;sN] returns the concatenation of strings s1,..,sN using sep as a separator when needed. Examples: concat "," ["hello";"world"] = "hello,world"; concat_sep ":" ["";"xy"] = "xy".