ABAP String processing

Data: foo TYPE string,
          result1 TYPE string,
          result2 TYPE string.
    foo = '---'.
    REPLACE '-' in foo WITH '+'.
    MESSAGE foo TYPE 'I'.
 
    "Zusammensetzen
    CONCATENATE 'foo' 'bar' '2' into foo.
    MESSAGE foo TYPE 'I'.
 
    "Splitten
    SPLIT foo AT 'o' into result1 result2.
    "MESSAGE result2 TYPE 'I'.
 
    DATA temp_tab TYPE TABLE OF string.
    SPLIT foo AT 'o' INTO TABLE temp_tab.
    CONCATENATE LINES OF temp_tab INTO foo.
    "MESSAGE foo TYPE 'I'.
 
    "Suchen
    DATA result_tab TYPE match_result_tab.
    DATA regexp TYPE string VALUE 'a+b'.
    FIND ALL OCCURRENCES OF REGEX regexp IN 'aaaabnnnaaab' IGNORING CASE RESULTS result_tab.
    CONCATENATE LINES OF result_tab  INTO foo.
    MESSAGE foo TYPE 'I'.