2

I tried replacing 30 chars from the beginning of each line of my text, but could not figure out how to specify to vi sed to do it.

I tried this:

:%s/.{3}/xx/

But it could not find my pattern. I thought {3} would mean 3 times the previous, but unfortunately not. { is not interpreted as a regex command but as a search char.

could anyone help?

4

If you look at :h magic:

Examples:

after:    \v       \m       \M       \V         matches 
                'magic' 'nomagic'
          $        $        $        \$         matches end-of-line
          .        .        \.       \.         matches any character
          *        *        \*       \*         any number of the previous atom
          ~        ~        \~       \~         latest substitute string
          ()       \(\)     \(\)     \(\)       grouping into an atom
          |        \|       \|       \|         separating alternatives
          \a       \a       \a       \a         alphabetic character
          \\       \\       \\       \\         literal backslash
          \.       \.       .        .          literal dot
          \{       {        {        {          literal '{'
          a        a        a        a          literal 'a'

The default node in regular expressions is \m (just magic), so you need to use \{ for the brace to seen as an operator:

                                        /\{ E58 E60 E554 E870
\{n,m}  Matches n to m of the preceding atom, as many as possible
\{n}    Matches n of the preceding atom
\{n,}   Matches at least n of the preceding atom, as many as possible
\{,m}   Matches 0 to m of the preceding atom, as many as possible

Try:

%s/.\{30}/xx/
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  • Thanks! This works for me under Linux , but not AIX. btw nothig with :h magic on my systems. – J. Chomel Apr 8 '16 at 9:33
  • 1
    under AIX it says Invalid character in interval expression ; but if I escape the second one, it works. – J. Chomel Apr 8 '16 at 9:36
2

In AIX vi, this will be:

:%s/.\{30\}/xx/
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