Search and replace sub-patterns using regex - regex

Question

I'm trying to use regular expressions to search/replace sub-patterns but I seem to be stuck. Note: I'm using TextWrangler on OSX to complete this.
SCENARIO:
Here is an example of a complete match:
{constant key0="variable/three" anotherkey=$variable.inside.same.match key2="" thirdkey='exists'}
Each match will always:
start with the following: {constant key0=
terminate with a single curly brace: }
contain one or more key=value pairs
the key of the first pair is constant (in this case, the key is key0)
the value of the first pair is variable (in this case, the value is "variable/three")
each additional pairs, if any, are separated by whitespace
Here's an example of what a minimal (but complete) match would look like (with only one key=value pair):
{constant key0="first/variable/example"}
Here's another example of a valid match, but with trailing whitespace after the last (and only) key=value pair:
{constant key0="same/as/above/but/with/whitespace/after/quote" }
GOAL:
What I need to be able to do is extract each key and each value from each match and then rearrange them. For example, I might need the following:
{constant key0="variable/4" variable_key_1="yes" variable_key_2=0}
... to look like this after all is said and done:
$variable_key_1 = "yes"; $variable_key_2 = 0; {newword "variable/4"}
... where
a $ has been added to the extracted keys
spaces have been added between each key=value pair's =
a ; has been appended to each extracted value
the word constant has been changed to newword, and
key0= has been removed completely.
Here are some examples of what I've tried (note that the first one actually works, but only when there is exactly one key/value pair):
Search:
(\{constant\s+key0=\s*)([^\}\s]+)(\s*\})
Replace:
{newword \2}
Search:
(\{constant\s+key0=)([^\s]+)(([\s]+[^\s]+)([\s]*=\s*)([^\}]+)+)(\s*\})
Replace:
I wasn't able to come up with a good way to replace the output of this one.
Any help would be most appreciated.

Answer 1

Because of the nature of this match, it's actually three different regexes—one to figure out what the match is, and two others to process the matches. Now, I don't know how you intend to escape the quotes, so I'll give one for each common escapement system.
Without further ado, here's the set for the backslash escapement system:
Find:
\{constant\s+key0=([^\s"]\S*|"(\\.|[^\\"])*")(\s+[^\s=]+=([^\s"]\S*|"(\\.|[^\\"])*"))*\s*\}
Search 1:
(?<=\s)([^\s=]+)=([^\s"]\S*|"(\\.|[^\\"])*")(?=.*\})
Replace 1:
$1 = $2;
Search 2:
^\{constant\s+key0 = ([^\s"]\S*|"(\\.|[^\\"])*");\s*(?=\S)(.*)\}
Replace 2:
$2 {newword $1}
Now the URL/XML/HTML escapement system, much easier to parse:
Find:
\{constant\s+key0=([^\s"]\S*|"[^"]*")(\s+[^\s=]+=([^\s"]\S*|"[^"]*"))*\s*\}
Search 1:
(?<=\s)([^\s=]+)=([^\s"]\S*|"[^"]*")(?=.*\})
Replace 1:
$1 = $2;
Search 2:
^\{constant\s+key0 = ([^\s"]\S*|"[^"]*");\s*(?=\S)(.*)\}$
Replace 2:
$2 {newword $1}
Hope this helps.