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On page 86 of Mastering Regular Expressions, Jeffrey Friedl mentions in a footnote that ed and grep used escaped parentheses because "Ken Thompson felt regular expressions would be used to work primarily with CĬode, where needing to match raw parentheses would be more common than backreferencing." I assume that he felt the same way about the plus sign, hence the need to escape it to use it as a metacharacter.
The + must be escaped in the regex because with sed's regex engine + is a normal character whereas \+ is a metacharacter for 'one or more'. won't work there since that's an abbreviation for a character class and the regex engine wouldn't know what character to put there. \+ # one or more of the previous item (anything matched in the brackets).įor your replacement, you only want to insert a space. # tab, carriage return, newline, vertical tab, or form feed. # functionally identical to which matches a space, # The POSIX character class for whitespace characters. Here's an explanation: [ # start of character class
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