字符串首字符索引爲 0; Character Fields: C,N, D, T, string (CNDT=> CN Data Time)
1. 字符串連接 CONCATENATE dobj1 dobj2 ... INTO result [IN { BYTE | CHARACTER } MODE] [SEPARATED BY sep].
2.字符串分隔, split 一個string的部分到一個內表或一系列的變量 SPLIT dobj AT sep INTO { {result1 result2 ...} | {TABLE result_tab} } [IN {BYTE|CHARACTER} MODE].
3. 字符串查找, 在一個字符串中查找模式串(FIND or SEARCH) FIND sub_string IN SECTION [OFFSET off] [LENGTH len] OF dobj --> 灰色部分用來縮小目的串被查找的範圍 [ IN { BYTE | CHARACTER } MODE ] [ { RESPECTING | IGNORING } CASE ] [ MATCH OFFSET moff ] [MATCH LENGTH mlen ].
FIND 'knows' IN SECTION OFFSET 5 OF 'Everybody knows this is nowhere' MATCH OFFSET moff " => moff = 10 MATCH LENGTH mlen. " => mlen= 5
在字符串dobj中查找pattern SEARCH dobj FOR pattern [IN { BYTE | CHARACTER } MODE] [STARTING AT p1] [ENDING AT p2] [ABBREVIATED] [AND MARK]. if sy-subrc = 0. then SY-FDPOS = 返回pattern在dobj中的位置 About pattern: 'pat' - 忽略尾部空格 '.pat.' -不忽略尾部空格 '*pat' - 以pat結尾 'pat*' - 以pat開始 單詞是指: 用 空格 , ; : ? ! () / + =分隔的字串
4. 字符串替換 REPLACE SECTION [OFFSET off] [LENGTH len] OF dobj WITH new [IN { BYTE | CHARACTER } MODE].
REPLACE [{FIRST OCCURRENCE}|{ALL OCCURRENCES} OF] [SUBSTRING] sub_string IN [SECTION [OFFSET off] [LENGTH len] OF ] dobj WITH new [IN {BYTE|CHARACTER} MODE] [{RESPECTING|IGNORING} CASE] [REPLACEMENT COUNT rcnt] [REPLACEMENT OFFSET roff] [REPLACEMENT LENGTH rlen]. eg: DATA: text1 TYPE string VALUE 'xababx'. REPLACE 'ab' IN text1 WITH 'xx'. --> xxxabx
5. 去前導0 (Remove leading zero) SHIFT dobj LEFT DELETING LEADING '0'. FM : CONVERSION_EXIT_ALPHA_OUTPUT
增前導0 (Add leading zero) DATA v_s(5). UNPACK '123' to v_s. ==> v_s = '00123' FM: CONVERSION_EXIT_ALPHA_INPUT
SHIFT dobj [{BY num PLACES} | {UP TO sub_string}] [LEFT|RIGHT] [CIRCULAR] SHIFT dobj {LEFT DELETING LEADING} | {RIGHT DELETING TRAILING} pattern. [IN {BYTE|CHARACTER} MODE].
6. 字符串的長度, 內表的行數 STRLEN( dobj) 字符串的長度 LINES( itab ) 內表的行數
7. 刪字符串中的空格: CONDENSE text [NO-GAPS].
8. 大小寫轉換，字符變換 TRANSLATE text {TO {UPPER|LOWER} CASE} | {USING pattern}. eg: text = `Barbcbdbarb`. TRANSLATE text USING 'ABBAabba'. =>'Abracadabra'
9. CONVERT CONVERT DATE dat [TIME tim [DAYLIGHT SAVING TIME dst]] INTO TIME STAMP time_stamp TIME ZONE tz.
CONVERT TIME STAMP time_stamp TIME ZONE tz INTO [DATE dat] [TIME tim] [DAYLIGHT SAVING TIME dst].
CONVERT TEXT text INTO SORTABLE CODE hex.
10. OVERLAY text1 WITH text2 [ONLY pattern]. 如果不指定後面的ONLY pattern, text1中的空格會被text2中的對應字符替代 如果指定只有匹配的字符纔會被替代，注意大小寫敏感
11. 模式匹配 CO / CN contains only or not CA / NA contains any or not any CS / NS contain string or not CP / NP contains pattern or not
NOTE: a) . CO, NO, CA, NA比較時區分大小寫， 並且尾部空格也在比較的範圍之內 data: s1(10) value 'aabb'. if s1 co 'ab' ==> false if s1 co 'ab ' ==>true CS, NS, CP, NP不區分大小寫和尾部空格
b) .對於CP, NP * = /s? + = /s # 換碼字符, 用於匹配 *, +這樣的字符 ## #* #+ #___ 比較結尾空格 #[a-z] 在CP, NP中強制區分大小寫
c) . 比較結束後，如果結果爲真，sy-fdpos將給出s2在s1中的偏移量信息
12. 特殊字符 在字符串中加入回車換行或TAB字符，在其他語言可以使用$13$10這樣的ASCII碼進行插入.但在ABAP中要使用sap的類CL_ABAP_CHAR_UTILITIES. 裏面有字符常量:CR_LF,HORIZONTAL_TAB,NEWLINE等等.
13. 字符串位操作 DATA: v_s(10) value 'abcd'. v_s+0(1) = 'b'. v_s+2(*) = '12'. => v_s = 'bb12'.
