INSERT inserts the string new, padded to length length, into the string target after
the n th character. If specified, n must be a nonnegative whole number. If n is greaterthan the length of the target string, padding is added there also. The default pad
character is a blank. The default value for n is 0, which means insert before the
WORDPOS searches string for the first occurrence of the sequence of blank-delimited
words phrase, and returns the word number of the first word of phrase in string.Multiple blanks between words in either phrase or string are treated as a single blank
for the comparison, but otherwise the words must match exactly.
By default, the search starts at the first word in string. You can override this by
specifying start (which must be positive), the word at which to start the search.