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LOWER
Converts all letters in the specified text string to lowercase. Any characters that are not letters are unaffected by this function. Locale rules are applied if a locale is provided.
Use
LOWER(text,
[locale]) and replace text with the field or
text you wish to convert to lowercase, and locale with the optional
two-character ISO language code or five-character locale code, if available.
LOWER("MYCOMPANY.COM") returns
“mycompany.com.”
LOWER(TickerSymbol) returns the text in Ticker
Symbol in lower case characters.
The Turkish language has two
versions of the letter “i”: one dotted and one dotless. The locale rules for Turkish require the
ability to capitalize the dotted i, and allow the dotless I to be lowercase. To correctly use
the LOWER() function with the Turkish language locale, use
the Turkish locale code tr in the LOWER() function as follows:
LOWER(text, "tr")
Using this locale code ensures that Salesforce doesn’t transform any dotted i in the text to a dotless I.

