[Programming] 在UltraEdit裡面使用正則表達式來搜尋

我想很多程式設計師的電腦裡面都有灌UltraEdit，因為UltraEdit在編輯文字檔上，還是蠻好用而且方便的，缺點是付費軟體，所以有些人也會灌其他免費軟體，如Notepad++…等。

不確定是9.0或10.0以後的UltraEdit(或者是更早)，開始支援利用Regular Expressions來做搜尋或是取代的動作。有在寫script language的人應該都知道Regular Expressions的好用，所以前陣子在用UltraEdit看debug log的時候，就嘗試想要使用Regular Expressions。可是不知道為什麼，似乎Regular Expressions都沒用，都找不到我想要找的關鍵字。

後來上網Google一下，原來是UltraEdit裡面所定義的Regular Expressions，跟我們一般寫code所使用的Symbols，有著些許的不同。下面就將我所參考的網頁弄成表格，將UltraEdit跟我們常用的Regular Expression 之間symbols的差異比較呈現出來。

UltraEdit Symbols	UNIX Symbols	Description of Regular Expression Symbols
%	^	Matches/anchors the beginning of line.
$	$	Matches/anchors the end of line.
?	.	Matches any single character except a newline character. Does not match repeated newlines.
*		Matches any number of occurrences of any character except newline.
+	+	Matches one or more of the preceding character/expression. At least one occurrence of the character must be found. Does not match repeated newlines.
++	*	Matches the preceding character/expression zero or more times. Does not match repeated newlines.
^	\	Indicates the next character has a special meaning. "n" on its own matches the character "n". "^n" (UE expressions) or "\n" (UNIX expressions) matches a linefeed or newline character. See examples below.
[]	[]	Matches any single character or range in the brackets.
[~xyz]	[^xyz]	A negative character set. Matches any characters NOT between brackets.
^b	\f	Matches a page break/form feed character.
^p	\p	Matches a newline (CR/LF) (paragraph) (DOS Files).
^r	\r	Matches a newline (CR Only) (paragraph) (MAC Files).
^n	\n	Matches a newline (LF Only) (paragraph) (UNIX Files).
^t	\t	Matches a tab character.
[0-9]	\d	Matches a digit character.
[~0-9]	\D	Matches a non-digit character.
[ ^t^b]	\s	Matches any white space including space, tab, form feed, etc., but not newline.
[~ ^t^b]	\S	Matches any non-white space character but not newline.
	\v	Matches a vertical tab character.
[0-9a-z_]	\w	Matches any alphanumeric character including underscore.
[~0-9a-z_]	\W	Matches any character except alphanumeric characters and underscore.
^{A^}^{B^}	(A|B)	Matches expression A OR B.
^	\	Overrides the following regular expression character.
^(...^)	(...)	Brackets or tags an expression to use in the replace command. A regular expression may have up to 9 tagged expressions, numbered according to their order in the regular expression.

參考資料：
Regular expressions with UltraEdit