Regular Expressions 101

Positive Lookahead(?=\n\s*\n|\z)

1st Alternative\n\s*\n

\na line-feed (newline) character (ASCII 10)

\s*any whitespace character, repeated any number of times

\na line-feed (newline) character (ASCII 10)

2nd Alternative\z

\zend of string

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?=\n\s*\n|\z)

New

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Iste mollitia similique, blanditiis quisquam suscipit optio quam culpa odit ad magni sunt officiis, recusandae deleniti alias, natus commodi sed expedita labore.

Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quae distinctio atque, eos quo. Autem commodi dicta, numquam natus illum recusandae quos! Veniam nulla et temporibus necessitatibus vero recusandae tempora saepe!

Substitution

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