Texas Instruments TI-84 - Manual (Page 422)

Chapter 15: CATALOG, Strings, Hyperbolic Functions 419
expr( expr( expr( expr(
expr( converts the character string contained in string to an expression and executes it.
string can be a string or a string variable.
expr(string)
inString( inString( inString( inString(
inString( returns the character position in string of the first character of substring . string can
be a string or a string variable. start is an optional character position at which to start the
search; the default is 1.
inString(string,substring[,start])
Note: If string does not contain substring , or start is greater than the length of string , inString(
returns 0 .