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# StringToLower
Transforms all symbols of a selected string into lowercase.
```
bool  StringToLower(
   string&  string_var      // string to process
   );
```
Parameters
string_var
[in][out]  String.
Return Value
In case of success returns true, otherwise - false. To get the [error code](/en/docs/constants/errorswarnings/errorcodes) call [GetLastError()](/en/docs/check/getlasterror).
Example:
```
void OnStart()
  {
//--- define the source string in uppercase
   string text=" - THIS STRING, WRITTEN IN UPPERCASE, MUST BE WRITTEN IN LOWERCASE";
//--- Display the source string in the log
   Print("Source line:\n", text);
//--- convert all string characters to lowercase and display the result in the log
   if(StringToLower(text))
      Print("The original string after using the StringToLower() function:\n", text);
      
   /*
   Result
   Source line:
    - THIS STRING, WRITTEN IN UPPERCASE, MUST BE WRITTEN IN LOWERCASE
   The original string after using the StringToLower() function:
    - this string, written in uppercase, must be written in lowercase
   */
  }
```
See also
[StringToUpper](/en/docs/strings/stringtoupper), [StringTrimLeft](/en/docs/strings/stringtrimleft), [StringTrimRight](/en/docs/strings/stringtrimright)