Instring; Length - Texas Instruments TI-83 Manual Book

inString(

returns the character position in of the first character of
inString( string
. can be a string or a string variable. is an optional
substring string start
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 .

length(

returns the number of characters in . can be a string or
length( string string
string variable.
Note: An instruction or function name, such as sin( or cos( , counts as one
character.
length( string )
TI-83 Plus CATALOG, Strings, Hyperbolic Functions 492