Regex to allow only a single slash but not multiple slashes-CodePudding

I am writing a regex to satisfy the following conditions no capital letters, no spaces, no underscores, umlauts or special characters and no multiple slashes.

I have implemented this /[^a-z\/{1}\s]/g but still it allows more than one slash. Any idea what I am missing .

if(value.match(/[^a-z\/{1}\s]/g) ){
    console.log(invalid)
 }

these values should fail to pass a test

  SHOULDNOTMATCH
  some_
  über
  ässs
  schleißheim
  some?sd
  some/7asa 
  some one
  shouldnotmatche//
  dont'allow
  /home//some/where/

These values should pass a test

   home
   page
   thisshouldpass
   someothertext

CodePudding user response：

Converting my comment to answer so that solution is easy to find for future visitors.

You may consider this regex for your cases:

/^[a-z] (?:\/[a-z]*)?$/igm

Which matches 1 letters at the start i.e. ^[a-z] followed by an optional group: (?:\/[a-z]*)? which means match a / followed by 0 or more letters before end position.

RegEx Demo

CodePudding user response：

See Demo for some explanations. As stated the explanation is behind the link.