via embedded expressions.

|{}|--------- || 中间写文字 {}中间放变量

... [WIDTH     = len] 
[ALIGN     = LEFT|RIGHT|CENTER|(dobj)|expr] 
[PAD       = c] 
[CASE      = RAW|UPPER|LOWER|(dobj)|expr] 
[SIGN      = LEFT|LEFTPLUS|LEFTSPACE|RIGHT|RIGHTPLUS|RIGHTSPACE|(dobj)|expr] 
[EXPONENT  = exp] 
[DECIMALS  = dec] 
[ZERO      = YES|NO|(dobj)|expr] 
[XSD       = YES|NO|(dobj)|expr] 
[STYLE     =  SIMPLE|SIGN_AS_POSTFIX|SCALE_PRESERVING 
             |SCIENTIFIC|SCIENTIFIC_WITH_LEADING_ZERO 
             |SCALE_PRESERVING_SCIENTIFIC|ENGINEERING 
             |(dobj)|expr] 
[CURRENCY  = cur] 
[NUMBER    = RAW|USER|ENVIRONMENT|(dobj)|expr] 
[ALPHA     = IN|OUT|RAW|(dobj)|expr] 
[DATE      = RAW|ISO|USER|ENVIRONMENT|(dobj)|expr] 
[TIME      = RAW|ISO|USER|ENVIRONMENT|(dobj)|expr] 
[TIMESTAMP = SPACE|ISO|USER|ENVIRONMENT|(dobj)|expr] 
[TIMEZONE  = tz] 
[COUNTRY   = cty] ... 

width align

DATA(text) =
  |{ 1 WIDTH = 1 ALIGN = LEFT  "  
  }{ 2 WIDTH = 2 ALIGN = RIGHT
  }{ 3 WIDTH = 5 ALIGN = RIGHT }<-|.

width 是指宽度 align 是值的位置

上面的结果是 1___2_____5 分别是3个空格和5个空格

case

"case 控制大小写 下面的是编码
DATA(text) = 
  |{ cl_abap_codepage=>convert_to( 'Hello World!' ) CASE = LOWER }| . 

"编码
xstr = cl_abap_codepage=>convert_to(
  source      = '江正军'
  codepage    = `UTF-8` ).
"解码
str = cl_abap_codepage=>CONVERT_FROM(
  source      =  xstr
  codepage    = `UTF-8` ).

pad

此格式选项定义用于填充结果中任何剩余位置的字符。 仅在使用WIDTH定义大于最小所需长度的长度时才应用它。
DATA(text) = |{ 'X' ALIGN = RIGHT WIDTH = 10 PAD = '_' }|. 
result is  _________X

DECIMALS = dec

DATA(text) = |{ 
- 2 / 3   DECIMALS = 3 },               { 
CONV decfloat34( - 2 / 3 ) DECIMALS = 3 }, { 
CONV          f( - 2 / 3 ) DECIMALS = 3 }|.

" result  is  -1.000, -0.667, -0.667 

alpha 去前缀零 或者添加零

alpha = in 是添加零

alpha = out 是去前缀零