I get an error when I try to use "^" or "$" in ruby ​​regular expression


Ruby version is 6.0.0 Rails version is An error has occurred in the above environment.

error contents

The provided regular expression is using multiline anchors (^ or $), which may present a security risk. Did you mean to use \A and \z, or forgot to add the :multiline => true option? (ArgumentError)

Apparently, "^" and "$" are causing an error because there is a security risk.

The solution

It was solved by changing it like ^ → \ A, $ → \ z according to the error statement!

Details about the error

After investigating, it seems that the above error appears in Rails 4.0 or later versions. Security is improving every day!

The reason why "^" and "" are at risk "^" → beginning of line "" → End of line Therefore, unexpected value tolerance occurs when multiple lines are passed.

for that reason "/ A" → the beginning of the character string "/ Z] → end of character string If you change it to, it will be read for each character string, so it is okay to pass multiple lines, so please use "/ A" and "/ z"! It was an error that the instruction came out.

By the way, if you use the ": multiline => true" option, you can also use "^" and "$", so if you are supposed to pass multiple lines, the solution using this option may be better. ..

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