How to do this find and replace?

i have been trying figure out regex find , replace (i thought easy!), frustration getting better of me , appreciated.  i'm trying 2 find , replaces:

 

1) in first, i'd find:

</script>

xxxx

</head>

 

where xxxx 4 letters (uppercase) , want store 4 letters variable ($1) use in replace

 

i'd replace bunch of javascript , in middle of script, i'd place variable referencing these 4 letters (<script type="text/javascript">var blah = new spry.data.xmldataset("http://$1.com"blahblah</script></head>

 

2) second find similar:

</html>

xxxxxxxx

 

where once again x 8 letters in uppercase following close of html tag (this has resulted previous find , replaces , i'm trying correct things)

 

i want delete these letters in case (so leave replace blank).

 

any appreciated!  thank you

after seeing 46 views , no replies figured must easy reading doesn't want waste time such easy question (or answer found).  had read adobe regex tutorial, must thick understand.  ended using coda , doing regex worked find, variable didn't work in replace:

 

for first one, did:

 

</script>.(\w\w\w\w).</head>

 

this found wanted, when trying replace $1 inside bunch of javascript, didn't work, nor did ($1) - should add javascript did have lot of symbols (%2, %22, etc left as-is, did not mark them in way - should these "commented out" in way?).  ended manually changing it, if knows did wrong please let me know.

 

for second one, did:

 

</html>.\w\w\w\w\w\w\w\w

 

hope helps else - thank you

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