Problem retrieving data that contains special characters in Collections

Hi fellow Apexers,
If I load strings that contain characters such as ":" or "," into a collection and then read the data back off the collection into page items via URL e.g.
f?p=&APP_ID.:4:&SESSION.::&DEBUG.::P4_INJURED_FIRST_NAME,P4_INJURED_OTHER_NAME,P4_INJURED_SURNAME,P4_INJURED_SHOP_NO,P4_INJURED_BUILDING,: #SEQ_ID#,#C001#,#C002#,#C003#,#C004#,#C005#
the data after the ":" or "," gets screwed up and ends up in the wrong fields. How do I escape these characters?
I have tried using a replace statement when inserting into the collection e.g.
BEGIN
IF htmldb_collection.collection_exists('INJURED_PERSON') = FALSE THEN
htmldb_collection.create_collection( p_collection_name => 'INJURED_PERSON');
htmldb_collection.add_member(p_collection_name => 'INJURED_PERSON',
p_C001 => :P4_INJURED_FIRST_NAME,
p_C002 => :P4_INJURED_OTHER_NAME,
p_C003 => :P4_INJURED_SURNAME,
p_C004 => :P4_INJURED_SHOP_NO,
p_C005 => replace(:P4_INJURED_BUILDING,':','')
etc.........
but I just don't want to have nested replace statements. Also I'll loose "," and ":" when I retrieve the back off the collection
Does anyone know of a better workaround?
Regards
Paul P

Hi Paul,
Apex uses colons in the url to separate the parameters. You could replace these with another character (for example, ~) and then have a Before Header page process on the second page that converts that back again.
However, as a collection is available until you clear it or log out, you could just pass the SEQ_ID and get the second page to retrieve the values directly into the page items
Andy

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