1360352 - String.match fails when regex String or RegExp(String) passed

Status: RESOLVED INVALID

(Firefox :: Untriaged, defect)

Description

[Jim Michaels]

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:53.0) Gecko/20100101 Firefox/53.0
Build ID: 20170413192749

Steps to reproduce:

"abcd1234".match(RegExp("/1234/"))


Actual results:

"abcd1234".match("/1234/")
null
"abcd1234".match(/1234/)
Array [ "1234" ]
"abcd1234".match(RegExp("/1234/"))
null


Expected results:

all should have worked, I had thought. at least the last one! only middle one worked.

Comment 1

[Tooru Fujisawa [:arai]]

you're misunderstanding the RegExp syntax and the pattern syntax.
leading and trailing slashes are not part of pattern, and you shouldn't pass it to RegExp constructor.

> "abcd1234".match("/1234/")

when you pass string to String#match, RegExp is created internally with the passed pattern.
so, in this case too, you shouldn't pass "/" there.