Regex to allow only a single slash but not multiple slashes

Question

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

Maybe test it out on regex101.com or similar websites. See what your regex actually matches here regex101.com/r/34U6Rz/1 — humble_barnacle
– humble_barnacle, Commented Feb 1, 2022 at 14:52
@humble_barnacle I already used that tool , as seen from the attached picture. strings with // are not matched — Kwaadjei
– Kwaadjei, Commented Feb 1, 2022 at 14:58
@anubhava your suggestion does not match anything including accepted values eg : 1. home 2. thisshouldmatch 3. page — Kwaadjei
– Kwaadjei, Commented Feb 1, 2022 at 15:29
ok then update question with accepted and not-accepted examples. — anubhava
– anubhava, Commented Feb 1, 2022 at 15:33

anubhava · Accepted Answer · 2022-02-01 17:15:00Z

3

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

answered Feb 1, 2022 at 17:15

anubhava

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