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Question
In linux, regular expression [...] , marked via the enclosing escaped-round-bracket syntax, group parts of a regular expression together, so they can be swapped or just displayed in chuncks via sed, for example.
subexpressions

Question
In linux, regular expression [...] , marked via the enclosing escaped-round-bracket syntax, group parts of a regular expression together, so they can be swapped or just displayed in chuncks via sed, for example.
?

Question
In linux, regular expression [...] , marked via the enclosing escaped-round-bracket syntax, group parts of a regular expression together, so they can be swapped or just displayed in chuncks via sed, for example.
subexpressions
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8. Streams and sed -- The Stream Editor
g text around within lines. Consider, for example, the output of ls : say you want to automatically strip out only the size column-- sed can do this sort of editing if you use the special  <span>notation to group parts of the regular expression together. Consider the following example: sed -e 's/$$<[^ ]*>$$$$[ ]*$$$$<[^ ]*>$$/\3\2\1/g' Here sed is searching for the expression \<.*\>[ ]*\<.*\> . From the chapter

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