The following are crucial:

 string searchReplace(stringInput stringSearchString stringNewString)
 replace all occurances of searchstring with newstring in inputstring

 string HTMLEncode.stringIn
 Find all <>&" and non-standarsd chars and replace them with &quot;, etc.

 list_of_strings tokenize.(stringIn tokenType)
 Return a list of strings consisting of the tokens in stringIn. 
 A token is:
   [whitespace]\n[whitespace]                if tokenType=SINGLE_BREAK
   [whitespace]\n[whitespace]\n[whitespace]  if tokenType=DOUBLE_BREAK
   [whitespace {' ' \t \r \n}]               if tokenType=WHITESPACE
   [whitespace {' ' \t \r}]                  if tokenType=PARTWHITESPACE
 In the case of the last, a single \n could be a token returned in the list.

 string pureWord.stringWord
   returns the string with all non-ASCIInumeric chars stripped off the ends.
   For instance, "  hello, dolly,\n" would give "hello, dolly"

 string ucase.stringWord
 string lcase.stringWord
   Change case.

It would be convenient if all functions that can take a single parameter 
could either take it as a single parameter or as a list of length 1.

The following aren't as important:

string makePara.(stringInput tokenType stringSeperator)
Returns string with all paragraph breaks changed to separator. Paragraph 
breaks are \n if type=SINGLE_BREAK or \nwhitespace\n