Freemaker Replace函數的Regex運用_java

replace(param1,param2,param3)

param1 Regex；param2 將匹配的字元替換成指定字元；param3 模式

param3 參數如下

模式	i	r	m	s	c	f
replace	支援	支援	只和r 組合	只和r 組合	只和r 組合	支援

模式解釋：

i: Case insensitive: 忽略大小寫

f: First only. That is, replace/find/etc. only the first occurrence of something.

r: The substring to find is a regular expression.標準Regex（http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html ）

m: Multi-line mode for regular expressions. In multi-line mode the expressions ^ and $ match just after or just before, respectively, a line terminator or the end of the string. By default these expressions only match at the beginning and the end of the entire string. Note that ^ and $ doesn't match the line-break character itself.

s: Enables dot-all mode for regular expressions (same as Perl singe-line mode). In dot-all mode, the expression . matches any character, including a line terminator. By default this expression does not match line terminators.

c: Permits whitespace and comments in regular expressions.在Regex中允許空格和注釋。

範例如下：

<#assign s = 'foo bAr baar'>${s?replace('ba', 'XY')}i: ${s?replace('ba', 'XY', 'i')}if: ${s?replace('ba', 'XY', 'if')}r: ${s?replace('ba*', 'XY', 'r')}ri: ${s?replace('ba*', 'XY', 'ri')}rif: ${s?replace('ba*', 'XY', 'rif')} 

輸出結果：

foo bAr XYar
i: foo XYr XYar
if: foo XYr baar
r: foo XYAr XYr
ri: foo XYr XYr
rif: foo XYr baar 

更多範例：

原文：str = 2積分兌換30元優惠券

${str?replace('\\b\\d+積分','','r')}

輸出：兌換30元優惠券

ps：freemarker的replace功能

替換字串 replace 

${s?replace(‘ba', ‘XY' )} ${s?replace(‘ba', ‘XY' , ‘規則參數')}

將s裡的所有的ba替換成xy 規則參數包含: i r m s c f 具體含義如下: 

· i: 大小寫不區分. 
· f: 只替換第一個出現被替換字串的字串 
· r:  XY是Regex 

· m: Multi-line mode for regular expressions. In multi-line mode the expressions ^ and $ match just after or just before, respectively, a line terminator or the end of the string. By default these expressions only match at the beginning and the end of the entire string. 

· s: Enables dotall mode for regular expressions (same as Perl singe-line mode). In dotall mode, the expression . matches any character, including a line terminator. By default this expression does not match line terminators. 

· c: Permits whitespace and comments in regular expressions.