Palindrome detection: Difference between revisions
Add ed example
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(Add ed example) |
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;;(equal? (string->list string) (reverse (string->list string)))))
</syntaxhighlight>
=={{header|ed}}==
A limitation: due to ed having no built-in loops, the part with palindrome beginning/end matching has to be repeated as many times and there's palindrome levels. As a sane default, 15 is used here.
<syntaxhighlight lang="sed">
# by Artyom Bologov
H
,p
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
g/^(.)(.+)\1$/s//\2/
v/^(.)(.+)\1$|^.$/s/.*/Not a palindrome!/
g/^.$/s//Palindrome!/
,p
Q
</syntaxhighlight>
{{out}}
<pre>$ cat palindrome.ed | ed -lEGs palindrome.input
rotor
racecar
level
rosetta
Palindrome!
Palindrome!
Palindrome!
Not a palindrome!</pre>
=={{header|Eiffel}}==
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