Regular Expressions 101

Pro

Negative Lookbehind(?<!\S)

\Sany character that is not Unicode whitespace

Negative Lookahead(?!\S*(?:http|www\.))

\S*any character that is not Unicode whitespace, repeated any number of times

Non-Capturing Group(?:http|www\.)

1st Alternativehttp

httpthe literal text http (case sensitive)

2nd Alternativewww\.

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\S{15}any character that is not Unicode whitespace, repeated exactly 15 times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?<!\S)(?!\S*(?:http|www\.))\S{15}

     
    mathfracint1x53x5 tantanboxedint1x01x2 sumvarp...   1   589 40
    mathoverbracesumvartheta8infty vecfracsumkappa...   1   498 31
    httpgooglecom check out the content of the www..    0   449 66
    mark had a great day he plans to go fishing with.   0   310 23