CODEWITHSUNDEEP
rregextwitterrstudiotext-mining
Ravindra Nadh
Ravindra Nadh

Reputation: 131

Regular Expression in R for twitter username

I am looking to handle and text between @ and : with out any space for example @rstat:. I would like to form a regular expression to handle this. I have tried ^@.[A-z0-9_].:$ but its not working.

Kindly help me here.

Upvotes: 0

Views: 370

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627537

The ^@.[A-z0-9_].:$ pattern matches the start of string (^), then a @, then any char (with .), then letters, digits, _, `, [, \, ], ^, then any char again, a : and end of string ($). So, it can match, say, a @§`‘: string.

You may use stringr str_extract_all like this

str_extract_all(x, "(?<=@)[^\\s:]+")

If you must check for the : presence, add a lookahead check:

str_extract_all(x, "(?<=@)[^\\s:]+(?=:)")
                                  ^^^^^

See the regex demo.

Details

  • (?<=@) - a location in string that is immediately preceded with @ symbol
  • [^\\s:]+ - 1 or more (due to +) chars other than whitespace and :
  • (?=:) - a positive lookahead that requires the presence of : immediately to the right of the current location.

Upvotes: 3

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