Description Instead of using a split, I think it would be easier to simply execute a match and process all the found matches. This expression will: divide your sample text on the comma delimits will process empty values will ignore double quoted commas, providing double quotes are not nested trims the delimiting comma from the … Read more
A slightly better way, avoiding the possible security implications of using eval, is declare “$var=$val” Note that declare is a synonym for typeset in bash. The typeset command is more widely supported (ksh and zsh also use it): typeset “$var=$val” In modern versions of bash, one should use a nameref. declare -n var=x x=$val It’s … Read more
You’ll want to use single quotes where you want double quotes to appear inside the string (e.g. for html attributes) without having to escape them, or vice versa. Other than that, there is no difference. However, note that JSON (JavaScript Object Notation) only supports double quoted strings.
” ” allows you to do string interpolation, e.g.: world_type=”Mars” “Hello #{world_type}”
The escape character in batch scripts is ^. But for double-quoted strings, double up the quotes: “string with an embedded “” character”
After a brief review of the YAML cookbook cited in the question and some testing, here’s my interpretation: In general, you don’t need quotes. Use quotes to force a string, e.g. if your key or value is 10 but you want it to return a String and not a Fixnum, write ’10’ or “10”. Use … Read more
/”(?:[^”\\]|\\.)*”/ Works in The Regex Coach and PCRE Workbench. Example of test in JavaScript: var s=” function(){ return ” Is big \\”problem\\”, \\no? “; }”; var m = s.match(/”(?:[^”\\]|\\.)*”/); if (m != null) alert(m);
Have you tried: eval $cmd For the follow-on question of how to escape * since it has special meaning when it’s naked or in double quoted strings: use single quotes. MYSQL=’mysql AMORE -u username -ppassword -h localhost -e’ QUERY=”SELECT “‘*'” FROM amoreconfig” ;# <– “double”‘single'”double” eval $MYSQL “‘$QUERY'” Bonus: It also reads nice: eval mysql … Read more
These dollar signs ($$) are used for dollar quoting, which is in no way specific to function definitions. It can be used to replace single quotes enclosing string literals (constants) anywhere in SQL scripts. The body of a function happens to be such a string literal. Dollar-quoting is a PostgreSQL-specific substitute for single quotes to … Read more
Actually, you can match all instances of a regex not inside quotes for any string, where each opening quote is closed again. Say, as in you example above, you want to match \+. The key observation here is, that a word is outside quotes if there are an even number of quotes following it. This … Read more