The IsPrefix( s, t ) command determines whether s is a prefix (initial substring) of t.

The string s is a prefix of the string t if , for some integer , or s is the empty string.

If s is a prefix of t, IsPrefix returns true. Otherwise, false is returned.

Note: The IsPrefix( s, t ) command is equivalent to the expression

The IsSuffix( s, t ) command determines whether s is a suffix (terminal substring) of t.

If s is a suffix of t, IsSuffix returns true. Otherwise, false is returned.

Note: The IsSuffix( s, t ) command is equivalent to the expression

The StringTools[IsPrefix] and StringTools[IsSuffix] commands are thread-safe as of Maple 15.

For more information on thread safety, see index/threadsafe.