IDE regular expressions/fr: what changed

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Title: IDE regular expressions/fr

New		Line
1	+	## Normal regular expression
2	+
3	+	Metacharacters:
4	+	```
5	+	\ Quote the next metacharacter
6	+	^ Match the beginning of the line
7	+	. Match any character (except newline). Example: 'a.c' matches 'abc', 'aBC', 'axc', 'a3c', 'a$c', etc.
8	+	$ Match the end of the line (or before newline at the end)
9	+	\| Alternation
10	+	() Grouping. For example: (abc)+ matches 'abc' or 'abcabc' or 'abcabcabc' etc.
11	+	[] Character class. For example [abc], [a-z], [a-zA-Z0-9_]
12	+	[^] Reversed character class. For example [^a-z]
13	+	```
14	+
15	+	Quantifiers:
16	+	```
17	+	* Match 0 or more times
18	+	+ Match 1 or more times
19	+	? Match 1 or 0 times
20	+	{n} Match exactly n times
21	+	{n,} Match at least n times
22	+	{n,m} Match at least n but not more than m times
23	+	```
24	+
25	+	Curly brackets in any other context is treated as a regular character. The ``*_is equivalent to {0,}, the ``+_ to {1,} and the ``?_to {0,1}._
26	+
27	+	By default, a quantifier is _greedy_ , that means, it will match as many times as possible. To match the minimum number of times possible, append a ``?_._
28	+	```
29	+	*? Match 0 or more times
30	+	+? Match 1 or more times
31	+	?? Match 0 or 1 time
32	+	{n}? Match exactly n times
33	+	{n,}? Match at least n times
34	+	{n,m}? Match at least n but not more than m times
35	+	```
36	+
37	+	## Simple Syntax
38	+
39	+	Some IDE dialogs provide a checkbox to enable 'simple syntax'. These regular expressions are shorter for common file name filters.
40	+
41	+	Technically it does this:
42	+	```
43	+	The following characters are replaced with
44	+	. -> \.
45	+	* -> .*
46	+	? -> .
47	+	, -> \|
48	+	; -> \|
49	+
50	+	Finally enclose by ^( )$
51	+	```
52	+
53	+	## Quoted symbols
54	+
55	+	The backslash '\' can be used to treat special characters like '.' as normal character or to get some special ranges.
56	+	```
57	+	\. matches a point '.'
58	+	\d matches a number character '0'..'9'
59	+	\D matches a non number character
60	+	\s matches a space character ' ',#9,#10,#12,#13
61	+	\S matches a non space character
62	+	\w matches a word character 'a'..'z','A'..'Z','0'..'9','_'
63	+	\W matches a non word character
64	+	\b word boundary
65	+	\B not word boundary
66	+	\A begin of line
67	+	\Z end of line
68	+	```
69	+
70	+	## Search and Replace with regular expressions
71	+
72	+	The find dialogs support regular expressions for finding and replacing. Each found pattern grouped in round brackets can be used by a $1, ..., $9 variable
73	+
74	+	For example:
75	+
76	+	* Find expression: a(.*)c
77	+	* Replace expression: A$1C
78	+	* Text: 'abc aLazc'
79	+
80	+	The $1 will be replaced with the found text, that matches the first bracket.
81	+
82	+	* Result: 'AbC ALazC'
83	+
84	+	---
85	+	From the Free Pascal wiki, page "IDE regular expressions/fr", as the Internet Archive kept it on 2020-10-31, last changed on 2007-06-26. 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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