格式跟UNIX/Perl略有不同吧，以下是UE帮助里面的

Symbol

Function

%

Matches the start of line – Indicates the search string must be at the beginning of a line but does not include any line terminator characters in the resulting string selected.

(match 行首)

$

Matches the end of line – Indicates the search string must be at the end of line but does not include any line terminator characters in the resulting string selected.

(match 行末)

?

Matches any single character except newline

(match 除新行外的任意单一字符)

*

Matches any number of occurrences of any character except newline

(match 除新行外的任意数目的任意字符)

+

Matches one or more of the preceding character/expression.

At least one occurrence of the character must be found.

(match 除新行外的超过0个的指定字符)

++

Matches the preceding character/expression zero or more times.

(match 指定字符的0或多次)

^b

Matches a page break

(match 一个分页符)

^p

Matches a newline (CR/LF) (paragraph) (DOS Files)

(match dos格式下的一个新行符)

^r

Matches a newline (CR Only) (paragraph) (MAC Files)

(MAC 格式)

^n

Matches a newline (LF Only) (paragraph) (UNIX Files)

(UNIX格式)

^t

Matches a tab character

(match tab符)

[ ]

Matches any single character, or range in the brackets

(match 单一的字符，或者括号内的字符范围中的一个)

^{A^}^{B^}

Matches expression A OR B

(match 表达式A或表达式B)

^

Overrides the following regular expression character

(忽略后面的正则表达式)

^(…^)

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.The corresponding replacement expression is ^x, for x in the range 1-9.

Example: If ^(h*o^) ^(f*s^) matches “hello folks”, ^2 ^1 would replace it with “folks hello”.

(将括号中的表达式赋给^1~^9使用，^1~^9应用在replace中)