Match a word if it follows itself:
Correct the problem (remove the second word):
\b matches a word break. It is zero bytes long and lifes on both sides of a word. In the words "|sides| |of| |a| |word|", each | shows the position of a \b.
The regex matches a word break (which is also before the first and behind the last word in a string/on a line), followed by a word (\w+) containing one or more of [a-zA-Z0-9_] followed by a non-word-char (\W) (which is everything but the chars listed before).
You know $1, which contains the contents of the first ( ) in the last executed regex? \1 is the same, but it's for the current regex and contains the word we found before by using \w+.
Adding another word-break at the end keeps us from matching /in/information/, because (\w+)\W\1 would match the in (as \w+ in ( ) going to \1), the / as match for \W and "in" of "information" for \1, because \1 contains the "in" from the \w+ match.
The first regex could be used on your whole text, there is no need to split it into lines.
The second regex removes any duplicate words converting /help/one/one/one/something to /help/one/something
Speaking of texts, some suggestions:
you may want to add a "+" after \W which would also match "text, text"
replace the \W by \/ to match only / instead of every non-word char
replace \w by [^\/] to allow everything between two / which is no /, but remember to also replace \b by \/ because \b won't work any longer
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||