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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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11
Task/String-matching/PL-I/string-matching-1.pli Normal file
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/* Let s be one string, t be the other that might exist within s. */
/* 8-1-2011 */
k = index(s, t);
if k = 0 then put skip edit (t, ' is nowhere in sight') (a);
else if k = 1 then
put skip edit (t, ' starts at the beginning of ', s) (a);
else if k+length(t)-1 = length(s) then
put skip edit (t, ' is at the end of ', s) (a);
else put skip edit (t, ' is within ', s) (a);
if k > 0 then put skip edit (t, ' starts at position ', k) (a);

20
Task/String-matching/PL-I/string-matching-2.pli Normal file
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/* Handle multiple occurrences. */
n = 1;
do forever;
k = index(s, t, n);
if k = 0 then
do;
if n = 1 then put skip list (t, ' is nowhere in sight');
stop;
end;
else if k = 1 then
put skip edit ('<', t, '> starts at the beginning of ', s) (a);
else if k+length(t)-1 = length(s) then
put skip edit ('<', t, '> is at the end of ', s) (a);
else put skip edit ('<', t, '> is within ', s) (a);
n = k + length(t);
if k > 0 then
put skip edit ('<', t, '> starts at position ', trim(k)) (a);
else stop;
end;