Regular Expressions 101

Pro

^start of line

Group 1(\w.*)

\wa Unicode word character

.*any Unicode character (except for line terminators), repeated any number of times

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

Group 2([\s\S]*?)

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sa Unicode whitespace character

\Sany character that is not Unicode whitespace

Non-Capturing Group(?:\n{2,}|\Z)

1st Alternative\n{2,}

\n{2,}a line-feed (newline) character (ASCII 10), repeated at least 2 times

2nd Alternative\Z

\Zend of string

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

^(\w.*)\n([\s\S]*?)(?:\n{2,}|\Z)

New

**** FILE.NAME ***
Fisrt sentence
    blablabla
    blablabla
    blablabla
    blablabla

Second sentence
    blablabla
    blablabla
    blablabla
    blablabla

Substitution

**** FILE.NAME ***
Fisrt sentence
    blablabla
    blablabla
    blablabla
    blablabla

Second sentence
    blablabla
    blablabla
    blablabla
    blablabla