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regexlsglob
Lucas Rezende
Lucas Rezende

Reputation: 2686

Regular Expression usage with ls

I am trying to use ER (Extended Regular Expressions) with ls like ls .+\..+.

I am trying to print all files which contains an extension (I know I could have used ls *.*, but I wanted to try using ER).

When I run that code I get this error: ls: .+..+: No such file or directory.

Upvotes: 55

Views: 141513

Answers (2)

wholerabbit
wholerabbit

Reputation: 11566

You don't say what shell you are using, but they generally don't support regular expressions that way, although there are common *nix CLI tools (grep, sed, etc) that do.

What shells like bash do support is globbing, which uses some similiar characters (eg, *) but is not the same thing.

Newer versions of bash do have a regular expression operator, =~:

for x in `ls`; do 
    if [[ $x =~ .+\..* ]]; then 
        echo $x; 
    fi; 
done

Upvotes: 6

Chris Seymour
Chris Seymour

Reputation: 85875

You are confusing regular expression with shell globbing. If you want to use regular expression to match file names you could do:

$ ls | egrep '.+\..+'

Upvotes: 117

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