How to write a regex that contains specific number of characters

Asked Feb 22 '16 at 12:50

Active Feb 22 '16 at 12:59

Viewed 37 times

I want to write a regex that contains only abcde, max five characters and a character can occur max one time. I tried [abcde]{1,5} but aa or bcb are valid for this expression. I am not good with regex and I have done some research but I could not find a solution.

How can I write such a regex?

Thanks for help.

edited Feb 22 '16 at 12:59

Jiri Tousek

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asked Feb 22 '16 at 12:50

xxlali

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You can do "max five characters" in regex, but not "a character can occur max one time". Try to solve the second part in java code. – f1sh Feb 22 '16 at 12:54
you can do it without regexp are you obliged to do it with regExp – achabahe Feb 22 '16 at 12:55
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`"^(?:([abcde])(?!.*\\1)){1,5}$"`? This is a solved issue, I linked to the original answer (you just needed a slight modification since you have one letter more) – Wiktor Stribiżew Feb 22 '16 at 12:56
`^(?:([abcde])(?![abcde]*?\1)){1,5}$` – Rahul Tripathi Feb 22 '16 at 12:57
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@WiktorStribiżew thanks a lot. I could not find this question – xxlali Feb 22 '16 at 13:13

How to write a regex that contains specific number of characters

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