CODEWITHSUNDEEP
regex
ntstha
ntstha

Reputation: 1173

Whats wrong with this regex

I have been solving quizes from regex101.com. One of the problems begins like this

For every occurence of the char #, backreference the previous character.
Example: for the text a#bc# -#, set backreferences with a, c and -.
You are not allowed to consume the hash character.

My solution to this problem is (\S)[?=#] and I think it's correct. Works well with a#bc# -# and abcd#.

But the site does not accept my answer. It tells me that I am consuming the hash character. I don't know what's wrong. I am not consuming hash character and this works perfectly in my java program.

Upvotes: 1

Views: 194

Answers (1)

Tim Pietzcker
Tim Pietzcker

Reputation: 336468

Syntax error:

(\S)(?=#)

(Don't use square brackets for lookaround assertions - [?=#] means "one of the letters ?, = or #)

Upvotes: 3

Related Questions