Need regex to remove unnecessary strings in Notepad++ - regex

Question

I have big css file and need regex(Notepad++) to get only elements and css selectors found by specific css value. In following example I need to get element and selector by value 123456
header #objectnav nav a {
border-right: solid 1px #c0c0c0;
border-left: solid 1px #f4f9ff;
color: #123456;
}
a:hover {
color: #654321;
}
#hints .hint {
background-color: #f4f9ff;
border: 1px solid #e0f0ff;
color: #123456;
margin: 0 0 30px 0;
position: relative;
}
on exit I expect following
header #objectnav nav a
color
#hints .hint
color
or, if possible
header #objectnav nav a^color
#hints .hint^color

Answer 1

I did this just for the challenge:
The following regex will find all the rules containing the text 123456 as a value:
[^{}\s][^{}]*\{[^}]*?[-\w]+\s*:[^;}]*?123456[^}]*\}
But that's just a basic regex. The more challenging part is that I wondered if it's possible to generate a report such as the one you asked for using nothing but Notepad++. It turns out it's possible.
Replace the following pattern:
\s*([^{}]+?)\s*\{[^}]*?(?(?=([-\w]+)\s*:[^;}]*?123456)[^}]*|[^}])*\}\s*
With the following replacement string:
(?2$1^$2:)
Or this one depending on the output you prefer:
(?2$1\r\n$2\r\n\r\n:)
I didn't test it extensively but it works for the test cases you provided.