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I need to change " to \" with JSTL replace function to use the string in input tag like: <input type="hidden" name="text" size="40" value="${text}"> If the ${text} has the " , the HTML will be broken. So I tried <input type="hidden" name="text" size="40" value="${fn:replace(text, "\"", "\\\""}"> and <input type="hidden" name="text" size="40" value="${fn:replace(text, '"', '\"'}"> but didn't worked. The page makes errors like org.apache.el.parser.ParseException: Encountered " "}" "} "" at line 1, column 32. Was expecting one of: "." ... ")" ... "[" ... "," ... ">" ... "gt" ... "<" ... "lt" ... ">=" ... "ge" ... "<=" ... "le" ... "==" ... "eq" ... "!=" ... "ne" ... "&&" ... "and" ... "||" ... "or" ... "*" ... "+" ... "-" ... "/" ... "div" ... "%" ... "mod" ... How can I do this? Update I missed a close paren of replace function. The right one was this one with a close paren: <input type="hidden" name="text" size="40" value="${fn:replace(text, '"', '\"')}"> Update2 I found out that when posting texts, using \ is not a good idea because of this reason why can't use \" in HTML input tag? . The code should be like this: <input type="hidden" name="text" size="40" value="${fn:replace(text, '"', '&quot;')}">

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