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I have a large file with many scattered file paths that look like
lolsed_bulsh.png I want to prepend these file names with an extended path like:
/full/path/lolsed_bullsh.png I'm having a hard time matching and capturing these. currently i'm trying variations of:
cat myfile.txt| sed s/\(.+\)\.png/\/full\/path\/\1/g | ack /full/path I think sed has some regex or capture group behavior I'm not understanding
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Although the simple searching and sorting can be performed using sed command, using regex with sed enables advanced level matching in text files. The regex works on the directions of characters used; these characters guide the sed command to perform the directed tasks.
Find and replace text within a file using sed command The procedure to change the text in files under Linux/Unix using sed: Use Stream EDitor (sed) as follows: sed -i 's/old-text/new-text/g' input.txt. The s is the substitute command of sed for find and replace.
Grouping can be used in sed like normal regular expression. A group is opened with “\(” and closed with “\)”. Grouping can be used in combination with back-referencing. Back-reference is the re-use of a part of a Regular Expression selected by grouping.
Capturing groups are a way to treat multiple characters as a single unit. They are created by placing the characters to be grouped inside a set of parentheses. For example, the regular expression (dog) creates a single group containing the letters "d" "o" and "g" .
In your regex change + with *:
sed -E "s/(.*)\.png/\/full\/path\/\1/g" <<< "lolsed_bulsh.png" It prints:
/full/path/lolsed_bulsh NOTE: The non standard -E option is to avoid escaping ( and )
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