special-characters

I have a log file (application.log) which might contain the following string of normal & special characters on multiple lines: *^%Q&$*&^@$&*!^@$*&^&^*&^& I want to search for the line number(s) which contains this special character string. grep '*^%Q&$*&^@$&*!^@$*&^&^*&^&' application.log The above command doesn't return any results. What would be the correct syntax to get the line numbers? Prince John Wesley Tell grep to treat your input as fixed string using -F option. grep -F '*^%Q&$*&^@$&*!^@$*&^&^*&^&' application.log Option -n is required to get the line number, grep -Fn '*^%Q&$*&^@$&*!^

What was the original historical use of the vertical tab character ( \v in the C language, ASCII 11)? Did it ever have a key on a keyboard? How did someone generate it? Is there any language or system still in use today where the vertical tab character does something interesting and useful? BillThor Vertical tab was used to speed up printer vertical movement. Some printers used special tab belts with various tab spots. This helped align content on forms. VT to header space, fill in header, VT to body area, fill in lines, VT to form footer. Generally it was coded in the program as a character

I need to match a word like 'César' for a regex like this /^cesar/i . Is there an option like /i to configure the regex so it ignores the acute accents?. Or the only solution is to use a regex like this /^césar/i . The standard ecmascript regex isn't ready for unicode (see http://blog.stevenlevithan.com/archives/javascript-regex-and-unicode ). So you have to use an external regex library. I used this one (with the unicode plugin) in the past : http://xregexp.com/ In your case, you may have to escape the char é as \u00E9 and defining a range englobing e, é, ê, etc. EDIT : I just saw the comment

I'm trying to escape several special characters in a given string using perl regex. It works fine for all characters except for the dollar sign. I tried the following: my %special_characters; $special_characters{"_"} = "\\_"; $special_characters{"$"} = "\\$"; $special_characters{"{"} = "\\{"; $special_characters{"}"} = "\\}"; $special_characters{"#"} = "\\#"; $special_characters{"%"} = "\\%"; $special_characters{"&"} = "\\&"; my $string = '$foobar'; foreach my $char (keys %special_characters) { $string =~ s/$char/$special_characters{$char}/g; } print $string; Try this: my %special_characters;