java - how to limit the number of "/" in a string -


how use lookahead assertion limit range number of "/"

i have tired following

^(?=/{1,3})$

but doesn't work

the easiest solution use negative lookahead:

^(?!(?:[^/]*/){4})

that means string cannot contain 4 slashes.

this assumes allow other characters between slashes, maximum of 3 slashes.

a positive version ^(?=[^/]*(?:/[^/]*){0,3}$) or ^[^/]*(?:/[^/]*){0,3}$, without lookahead. of course, problem trivial without regular expressions, if possible.

lets try break last 1 down:

  • ^ - start of string.
  • [^/]* - characters not slashes (or none)
  • (?: ) - logical group. similar (), not capture result (we not need after validation)
  • /[^/]* - slash, followed non-slash characters.
  • {0,3} - 0 3 times.
  • $ - end of string.

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