replace(param1,param2,param3)

param1 正则表达式；param2 将匹配的字符替换成指定字符；param3 模式

param3 参数如下

模式解释：

i: Case insensitive: 忽略大小写

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

r: The substring to find is a regular expression.标准正则表达式（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.在正则表达式中允许空格和注释。

范例如下：

<#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‘)}  

输出结果：

foo bAr XYari: foo XYr XYarif: foo XYr baarr: foo XYAr XYrri: foo XYr XYrrif: foo XYr baar 

更多范例：

原文：str = 2积分兑换30元优惠券${str?replace(‘\\b\\d+积分‘,‘‘,‘r‘)} 输出：兑换30元优惠券

更多信息可以参考：

http://freemarker.org/docs/ref_builtins_string.html#ref_builtin_replace

Freemaker Replace函数的正则表达式运用