Replace spaces
s/^\s+// leading
s/\s+$// trailing
both ends:
s/^\s*(.*)\s*$/$1/ " abc " => "abc " because of the greediness
s/^\s*(.*?)\s*$/$1/ " abc " => "abc" minimal match
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s/^\s+// leading
s/\s+$// trailing
both ends:
s/^\s*(.*)\s*$/$1/ " abc " => "abc " because of the greediness
s/^\s*(.*?)\s*$/$1/ " abc " => "abc" minimal match