JSF：如何替换“\\”在一个字符串中 [英] JSF: How to replace "\\" in a string

问题描述

假设我有字符串 text \\ ，我需要用<替换 \\ code> / 。我尝试了以下表达式：

Suppose I have the string text\\, I need to replace \\ with /. I tried the following expression:

/*  str = "text\\"  */
<h:outputText value="#{fn:replace(str, '\\', '/')}" />

但我总是遇到以下异常：

But I always run into the following exception:

Caused by: java.util.regex.PatternSyntaxException: Unexpected internal error near index 1
\
^
at java.util.regex.Pattern.error(Pattern.java:1924)
at java.util.regex.Pattern.compile(Pattern.java:1671)
at java.util.regex.Pattern.<init>(Pattern.java:1337)
at java.util.regex.Pattern.compile(Pattern.java:1022)
at java.lang.String.replaceAll(String.java:2210)
at com.sun.faces.facelets.tag.jstl.fn.JstlFunction.replace(JstlFunction.java:222)

如果你能给我一个建议，我将非常感激。

I'd be very grateful if you could give me an advice.

更新：根据以下答案，我找到了以下表达式将起作用：

UPDATE: Based on the answers below, I found out that the following expression will work:

<h:outputText value="#{fn:replace(str, '\\\\', '/')}" />

祝你好运，

推荐答案

试试这个（尚未检查....）

Try this (haven't checked....)

<ui:param name="mydouble" value="\\\\"></ui:param>
<ui:param name="mysingle" value="/"></ui:param>
<h:outputText value="#{fn:replace(str, mydouble, mysingle)}" />

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