Selecting string between two markers
(?<=Marker1).*(?=Marker2)
(?<= ) is called Positive Lookbehind
.* matches any character (except for line terminators)
(?= ) is called Positive Lookahead
Keeping exactly one space + trim trailing + trim leading spaces
Key to search
^\s+|\s+$|\s+(?=\s)
^ = start of line
\s = searches for a space
+ = matches between one and unlimited times
^\s+ = From start of line select spaces (one to unlimited)
$ = Till end of line
\s+$ = From a space till end of line
(?= ) is called Positive Lookahead
\s+(?=\s) = Select more than one space
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