Regex to validate a character at start and end but also multiple occurences in between -


i need prevent character / occurring in java string @ start , end , // anywhere alphanumerics allowed along .,()?'+/

i have ^[^/]?([\w\-\?:().,'+]/?)*[^/]$

the main problem allows invalid characters # , ## @ start.

also tried ^[^/]?([^\w_\-\?:().,'+]/?)*[^/]$ remove _ underscore issue caused \w

so these invalid

/ a//a a/ # ##

but these valid

a/a a/a.,()+a

give chance simple. there's no need negated character classes ([^x] - "anything x") or negative lookarounds ((?<!x), (?!x) - "nothing, or not x"). know characters allowed everywhere in string, spell out: 

^[a-za-z0-9?:().,'+-]+(?:/[a-za-z0-9?:().,'+-]+)*$

you don't need specify slash (/) can't first, list characters can. , when slash appear, make sure it's followed @ least 1 of other allowed characters. , anchors (^ , $) ensure nothing else gets in.


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