Looking for a JS regex which should return false, when the string contains :

1. Two consecutive forward slash, Or/And
2. Any of the special character except hyphen and underscore.

Note: It should have cross browser compatibility as negative lookahead/lookbehind is not supported in Safari.

I have tried this regex: /(^[\w-\/] $)(?<!.*?\/{2,}.*$)/ It works for my use case but its not supported in safari, because of the negative lookbehind.

Expected Behaviour :

Can Match any below:

asc/_bsj
acs-h-
acs
acs/bgt

Can't match any below:

acs//
acs/@
acs@

CodePudding user response：

const regex = /\/\/|[!.*?@]/g
const strings = [
'asc/_bsj',
'acs-h-',
'acs',
'acs/bgt',
'acs//',
'acs/@',
'acs@'
]

for (const string of strings) {
  console.log(string, string.match(regex) ? 'no' : 'yes')
}

CodePudding user response：

You could write your pattern without any lookarounds by removing the / from the character class, and optionally repeat the allowed characters with a leading forward slash.

^[\w-] (?:\/[\w-] )*$

Regex demo

const regex = /^[\w-] (?:\/[\w-] )*$/;
[
  "asc/_bsj",
  "acs-h-",
  "acs",
  "acs/bgt",
  "acs//",
  "acs/@",
  "acs@"
].forEach(s =>
  console.log(`${s} --> ${regex.test(s)}`)
);