String Functions In Corona

Here is a list of string function which are very useful...

string.byte()	Returns the internal numerical codes of the characters in a string.
string.char()	Returns a string in which each character has the internal numerical code equal to its corresponding argument.
string.find()	Looks for the first match of a pattern in a string. If found, it returns the indices where the occurrence starts and ends; otherwise, returns nil.
string.format()	Returns a formatted string following the description given in its arguments.
string.gmatch()	Returns a pattern-finding iterator.
string.gsub()	Replaces all occurrences of a pattern in a string.
string.len()	Returns the length of a string (number of characters).
string.lower()	Changes uppercase characters in a string to lowercase.
string.match()	Extracts substrings by matching patterns in a string.
string.rep()	Replicates a string by returning a string that is the concatenation of n copies of a specified string.
string.reverse()	Reverses a string.
string.sub()	Returns a substring (a specified portion of an existing string).
string.upper()	Changes lowercase characters in a string to uppercase.