Palindrome: what changed

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Title: Palindrome

New		Line
1	+	<figure>
2	+	<img src="fpc_source_logo.png" title="fpc_source_logo.png" />
3	+	<figcaption>fpc_source_logo.png</figcaption>
4	+	</figure>
5	+
6	+	# Palindrome
7	+
8	+	A palindrome is a word, phrase, number, or other sequence of symbols or elements, whose meaning may be interpreted the same way in either forward or reverse direction
9	+
10	+	# Examples
11	+
12	+	## English
13	+
14	+	- racecar
15	+	- A man, a plan, a canal: Panama
16	+	- Madam I'm Adam
17	+
18	+	## Arabic
19	+
20	+	- مودته تدوم لكل هول * وهل كل مودته تدوم
21	+
22	+	## Armenian
23	+
24	+	- Արա իմ, առած դրամ՝ քաղաքեքաղաք մարդ ծառա մի արա
25	+	- Սերամա՜հ եթե համարես
26	+
27	+	## Finnish
28	+
29	+	- saippuakivikauppias
30	+	- No niin, on aamu. Kehua sinua kai saan, ah, ihana Kristian. Nait Sirkan, ah, ihana asia, kaunis. Au, hekumaa. No niin on.
31	+	- No, oikotie vei Tokioon.
32	+
33	+	## Russian
34	+
35	+	- А роза упала на лапу Азора
36	+	- луну дунул
37	+	- лак резала зеркал
38	+
39	+	# Function IsPalindome
40	+
41	+	This function is suitable for both [[ASCII]] and [[UTF-8]] encoding.
42	+
43	+	``` pascal
44	+	function IsPalindome(const a_text: string): boolean;
45	+	var
46	+	i, j :longint;
47	+	s1, s2, s3 :string;
48	+	begin
49	+	s1 := UTF8LowerCase( a_text );
50	+	j := length( s1 );
51	+	i := 1;
52	+	s2 := '';
53	+	s3 := '';
54	+	while ( i <= j ) do
55	+	begin
56	+	if s1[i] < #$C0 then // ASCII
57	+	begin
58	+	if (s1[i] >= #$30) and (s1[i] < #$7B)then
59	+	begin
60	+	if (s1[i] > #$60) or (s1[i] < #$3A) then
61	+	begin
62	+	s2 := s1[i] + s2;
63	+	s3 := s3 + s1[i];
64	+	end;
65	+	end;
66	+	inc( i );
67	+	end
68	+	else
69	+	begin
70	+	begin
71	+	if s1[i] < #$E0 then // two byte
72	+	begin
73	+	if ((s1[i] > #$C2) and ( not
74	+	// Armenian punctuation
75	+	((s1[i] = #$D5) and ((s1[i+1] >= #$99) and (s1[i+1] < #$A0)))
76	+	)) then
77	+	begin
78	+	s2 := s1[i]+ s1[i+1] + s2;
79	+	s3 := s3 + s1[i] + s1[i+1];
80	+	end;
81	+	inc( i ,2);
82	+	end
83	+	else
84	+	begin
85	+	if s1[i] < #$F0 then // three byte
86	+	begin
87	+	if not (
88	+	// General punctuation
89	+	(s1[i] = #$E2) and ((s1[i+1]= #$80)
90	+	or ((s1[i+1]= #$81) and (s1[i+2]< #$B0)))
91	+	) then
92	+	begin
93	+	s2 := s1[i]+ s1[i+1] + s1[i+2]+ s2;
94	+	s3 := s3 + s1[i] + s1[i+1] + s1[i+2];
95	+	end;
96	+	inc( i ,3);
97	+	end
98	+	else
99	+	begin
100	+	s2 := s1[i]+ s1[i+1] + s1[i+2]+ s1[i+3] + s2;
101	+	s3 := s3 + s1[i] + s1[i+1] + s1[i+2] + s1[i+3];
102	+	inc( i ,4);
103	+	end
104	+	end;
105	+	end;
106	+	end;
107	+	end;
108	+	if s2 <> '' then result := s2=s3 else result := false;
109	+	end;
110	+	```
111	+
112	+	---
113	+	From the Free Pascal wiki, page "Palindrome", as it stood on 2020-02-23 after a change by Trev, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's [[Licensing]] page. If you have concerns about this material, [message the admin](/wiki-contact).

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