(match-start match-end reg-starts reg-ends regex target-string &optional
result-form &key start end)
&body body &environment env)
|Function: Iterates over TARGET-STRING and tries to match REGEX as often as possible evaluating BODY with MATCH-START, MATCH-END, REG-STARTS, and REG-ENDS bound to the four return values of each match in turn. After the last match, returns RESULT-FORM if provided or NIL otherwise. An implicit block named NIL surrounds DO-SCANS; RETURN may be used to terminate the loop immediately. If REGEX matches an empty string the scan is continued one position behind this match. BODY may start with declarations.