![]() At other positions, ^ and $ have no special meaning and simply represent themselves. A $ at the end of a pattern anchors the match at the end of the subject string. A ^ at the beginning of a pattern anchors the match at the beginning of the subject string. Represents the complement of set as interpreted above.Ī pattern is a sequence of pattern items (see below). The interaction between ranges and classes is not defined, so patterns like or have no meaning. represents the octal digits plus lowercase letters plus the - character. For example, or represents all alphanumeric characters plus the underscore. All other characters in set represent themselves. All classes described above can also be used as components in the set. A range of characters can be specified by separating the end characters of the range with a - (hyphen). Represents the union of all characters in set. Any punctuation character - even non-magic - can be preceded by a % when used to represent itself in a pattern. When x is any non-alphanumeric character, this is the standard way to escape the magic characters. Represents the character with representation 0. Returns a substring (a specified portion of an existing string).Ĭhanges lowercase characters in a string to uppercase. Returns a boolean true or false depending on whether a given string starts with specified characters. Replicates a string by returning a string that is the concatenation of n copies of a specified string. Returns the length of a string (number of characters).Ĭhanges uppercase characters in a string to lowercase.Įxtracts substrings by matching patterns in a string. Replaces all occurrences of a pattern in a string. ![]() Returns a formatted string following the description given in its arguments. If found, it returns the indices where the occurrence starts and ends otherwise, returns nil. Looks for the first match of a pattern in a string. Returns a boolean true or false depending on whether a given string ends with specified characters. Returns a string in which each character has the internal numerical code equal to its corresponding argument. I hope you found this tutorial helpful! Whether you choose to use the string.lower function or a loop, converting a string to lower case in Lua is a breeze.Returns the internal numerical codes of the characters in a string. However, it requires a bit more manual handling of the string and is less efficient than using string.lower directly. This method allows for more flexibility as you can perform additional operations on each character if needed. Finally, we print lowerStr to the console, which will output ""hello world"". We then convert the character to lower case using string.lower and concatenate it with lowerStr using the concatenation operator. ![]() Within the loop, we use string.sub to extract each character at index i. Next, we iterate over each character in str using a for loop. Then, we create an empty string lowerStr to store the converted string. In this code snippet, we declare a variable str and assign it the value ""HeLlO WoRlD"". string.lower(char)Įnd print(lowerStr) - Output: hello world Local str = ""HeLlO WoRlD "" local lowerStr = """" for i = 1, #str do local char = string.sub(str, i, i)
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