How to use {{ }} in Javascript regular expression [duplicate]

Question

I need to verify this pattern:

{{ a valid variable name }}

Something like this:

/{{aaaa}}     ---> matches
/{{a}}        ---> matches
/{{a1a}}      ---> matches
/             ---> matches
/{aaa}}       ---> no matches
/{aaa}        ---> no matches
/{{aaa}       ---> no matches
/aaa}}        ---> no matches
/{{aaa        ---> no matches

and so forth...

I have this pattern:

^\\/(({){2}[A-Za-z0-9]+(}){2})*$

According to https://www.debuggex.com/#cheatsheet it is well written, but it doesn't work. Any suggestion on how to solve this?

What does it mean by "it doesn't work"? Which tests does it fail? — Sweeper
– Sweeper, Commented Apr 13, 2020 at 14:45
It is not a good practice to downvote without saying why. Also, this question has nothing to do with the suggested stackoverflow.com/questions/4674237/…, completely different questions. — assembler
– assembler, Commented Apr 14, 2020 at 13:08

user6597761 · Accepted Answer · 2020-04-13 14:46:13Z

1

At the start, you need to escape the / correctly:

^\/(({){2}[A-Za-z0-9]+(}){2})*$
 ^

Also, this can be simplified by removing the {2}:

^\/(({{)[A-Za-z0-9]+(}}))*$

answered Apr 13, 2020 at 14:46

user6597761

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