Regular expression to change erroneous JSTL information fails

Question

// THIS IS WHAT TO LOOK FOR: <c:param name="[name]" value="<%= [value] %>" />
  if (stuff.indexOf(".com/jstl") >= 0) {
   stuff = stuff.replaceAll(".com/jstl", ".com/jsp/jstl");
  Matcher matcher = Pattern.compile("(<c:param[ \\t]+name=\"[^\"]+\"[ \\t]+value=\")<%=([^%=\"]+)%>(\".*$)").matcher(stuff);
  if (matcher.matches()) {
    matcher.replaceAll("$1\${$2}$3");
  }What I am trying to do is very simple but brain-numbing for the past few days. I found out that about 100 different JSP scripts have the wrong information:
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<c:import name="header.jsp" context="/globals" >
   <c:param name="path" value="<%= path %>" />
</c:import>What I am supposed to apparently have is this:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<c:import name="header.jsp" context="/globals" >
  <c:param name="path value="${path}" />
</c:import>
{code}
But changing 100 scripts manually is extremely hard especially when you don't know where they are among the 250 other scripts within the entire portal.  Thus, I wrote a Java class I can run from the command-line to do this for me, however, the regular expression pattern I selected to make the change constantly fails.
I can't seem to figure out why it fails as I've tested using various online regular expression testers and it's the most accurate assuming Java uses POSIX. 
Help very much appreciated, thanks                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

Phil_The_Lifeless_Programmer wrote:
I don't see how you proposed that solution, unless you proposed it in a way that I could not understand, it sounded as if you were trying to point out flaws w/o a solution.I pointed out the flaws along a solution. You specified only one backslash in the replacement pattern. A backslash is an escape character in String. You need to add one more backslash to represent an actual backslash. You are invoking Matcher#replaceAll() without doing anything with its result and expected that changes are reflected in 'stuff'. I pointed that out too, along with the recommendation that you need to assign and use its return value.
It might be my English or your stressfull head that you misunderstood it. But don't complain that I didn't give the solution. Or do you only qualify complete code snippets as a solution?
I forgot to also mention that you have to run the Java class program multiple times manually in spite of the while loop. It appears to only replace the very last instance of the pattern in the file and nothing else. If you manually run it multiple times only then does it replace each line, from last to first.Your regex might just be wrong, it look like that it only matches the first occurrence. I am not an advanced regex expert, so I can't say much about this. Consider reposting this question (in a more friendly form!) in the Java Programming forum. There walk a lot of regex guru's around, e.g. uncle_alice, sabre150 and prometheuzz.
Good luck, man. And please take a breathe.