How to match any non white space character except a particular one

Question

In Perl  S matches any non-whitespace character   How can I match any non-whitespace character except a backslash

User · Accepted Answer

You can use a character class       s       matches anything that is not a whitespace character nor a     Here s another example    abc  means  match a  b or c     abc  means  match any character except a  b or c

User · Answer

On my system  CentOS 5  I can use  s outside of collections but have to use   space   inside of collections  In fact I can use   space   only inside collections  So to match a single space using this I have to use    space    Which is really strange   echo a b cX   sed -r  s  a sb   space   c    space     Result   1    Result  a b cX    first space I match with  s second space I match alternatively with    space    the X I match with  all but no space      space      These two will not work   a  space  b  instead use a sb or a   space   b  a   s b      instead use a    space   b

User · Answer

You can use a lookahead        S

User · Answer

This worked for me using sed  Edit  comment below points out sed doesn t support  s          while     s     didn t    Delete everything except space and  g  echo  ghai ghai    sed  s    sg   g  gg  echo  ghai ghai    sed  s    g   g  g g

[regex] How to match any non white space character except a particular one?

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