sed replace filename以引号开头

Question

I have in the file strings like img src="../image/popup.jpg" , or bg: 'images/xxx/popup.png' . I would like to replace the entire filepath/name with another string with sed , I tried

sed 's/^"[^\s]*/somethingelse/g' 

Answer 1

试试这个，

 sed 's|/some/UNIX/path|/a/new/path|g' files

Answer 2

When using sed to substitute pathnames, changing its default demiliter helps, as noted by Skynet, and judicious use of single quotes allows variable interpolation like this:

> a="\"hello/bye\""
> b="\"one/two\""
> echo $a
"hello/bye"
> echo $b
"one/two"
> echo $a|sed -e 's|'$a'|'$b'|'
"one/two"

From http://linux.die.net/man/1/sed sed does not support POSIX. 2 basic regular expressions "completely because of performance problems", however it comes close. According to http://www.regular-expressions.info/posix.html , one of the rules of POSIX regexes is "Using a backslash to escape a character that is never a metacharacter is an error." Since double and single quotes are not metacharacters, they should not be backslashed in POSIX regexes according to this.

Answer 3

Using sed with BRE:

sed "s/\([\"']\)[^\"']*\([\"']\)/\1somethingelse\2/g" file

With ERE:

sed -r "s/([\"'])[^\"']*([\"'])/\1somethingelse\2/g" file

Assumed there's no escaped quote in filename, ie no quote inside "..." and '...'