Comparing Strings
Similarly to the special statements for
processing strings, there are special comparisons that you can apply to strings with types C, D, N, and T. You can use the following operators:
<operator> |
Meaning |
CO |
Contains Only |
CN |
Contains Not only |
CA |
Contains Any |
NA |
contains Not Any |
CS |
Contains String |
NS |
contains No String |
CP |
Contains Pattern |
NP |
contains No Pattern |
There are no conversions with these comparisons. Instead, the system compares the characters of the string. The operators have the following functions:
CO (Contains Only)
The logical expression
<f1> CO <f2>
is true if <f1> contains only characters from <f2>. The comparison is case-sensitive. Trailing blanks are included. If the comparison is true, the system field SY-FDPOS contains the length of <f1>. If it is false, SY-FDPOS contains the offset of the first character of
<f1> that does not occur in <f2> .CN (Contains Not only)
The logical expression
<f1> CN <f2>
is true if <f1> does also contains characters other than those in <f2>. The comparison is case-sensitive. Trailing blanks are included. If the comparison is true, the system field SY-FDPOS contains the offset of the first character of
<f1> that does not also occur in <f2>. If it is false, SY-FDPOS contains the length of <f1>.CA (Contains Any)
The logical expression
<f1> CA <f2>
is true if <f1> contains at least one character from <f2>. The comparison is case-sensitive. If the comparison is true, the system field SY-FDPOS contains the offset of the first character of
<f1> that also occurs in <f2> . If it is false, SY-FDPOS contains the length of <f1>.NA (contains Not Any)
The logical expression
<f1> NA <f2>
is true if <f1> does not contain any character from <f2>. The comparison is case-sensitive. If the comparison is true, the system field SY-FDPOS contains the length of <f1>. If it is false, SY-FDPOS contains the offset of the first character of
<f1> that occurs in <f2> .CS (Contains String)
The logical expression
<f1> CS <f2>
is true if <f1> contains the string <f2>. Trailing spaces are ignored and the comparison is not case-sensitive. If the comparison is true, the system field SY-FDPOS contains the offset of <f2> in
<f1> . If it is false, SY-FDPOS contains the length of <f1>.NS (contains No String)
The logical expression
<f1> NS <f2>
is true if <f1> does not contain the string <f2>. Trailing spaces are ignored and the comparison is not case-sensitive. If the comparison is true, the system field SY-FDPOS contains the length of <f1>. If it is false, SY-FDPOS contains the offset of <f2> in
<f1> .CP (Contains Pattern)
The logical expression
<f1> CP <f2>
is true if <f1> contains the pattern <f2>. If <f2> is of type C, you can use the following wildcards in <f2>:
Trailing spaces are ignored and the comparison is not case-sensitive. If the comparison is true, the system field SY-FDPOS contains the offset of <f2> in
<f1> . If it is false, SY-FDPOS contains the length of <f1>.If you want to perform a comparison on a particular character in <f2>, place the escape character # in front of it. You can use the escape character # to specify
NP (contains No Pattern)
The logical expression
<f1> NP <f2>
is true if <f1> does not contain the pattern <f2>. In <f2>, you can use the same wildcards and escape character as for the operator CP.
Trailing spaces are ignored and the comparison is not case-sensitive. If the comparison is true, the system field SY-FDPOS contains the length of <f1>. If it is false, SY-FDPOS contains the offset of <f2> in
<f1> . 
DATA: F1(5) TYPE C VALUE <f1>,
F2(5) TYPE C VALUE <f2>.
IF F1 <operator> F2.
WRITE: / 'Comparison true, SY-FDPOS=', SY-FDPOS.
ELSE.
WRITE: / 'Comparison false, SY-FDPOS=', SY-FDPOS.
ENDIF.
The following table shows the results of executing this program, depending on which operators and values of F1 and F2.
<f1> |
<operator> |
<f2> |
Result |
SY-FDPOS |
'BD ' |
CO |
'ABCD ' |
true |
5 |
'BD ' |
CO |
'ABCDE' |
false |
2 |
'ABC12' |
CN |
'ABCD ' |
true |
3 |
'ABABC' |
CN |
'ABCD ' |
false |
5 |
'ABcde' |
CA |
'Bd ' |
true |
1 |
'ABcde' |
CA |
'bD ' |
false |
5 |
'ABAB ' |
NA |
'AB ' |
false |
0 |
'ababa' |
NA |
'AB ' |
true |
5 |
'ABcde' |
CS |
'bC ' |
true |
1 |
'ABcde' |
CS |
'ce ' |
false |
5 |
'ABcde' |
NS |
'bC ' |
false |
1 |
'ABcde' |
NS |
'ce ' |
true |
5 |
'ABcde' |
CP |
'*b*' |
true |
1 |
'ABcde' |
CP |
'*#b*' |
false |
5 |
'ABcde' |
NP |
'*b*' |
false |
1 |
'ABcde' |
NP |
'*#b*' |
true |
5 |