Regular Expressions 101

^start of string

Group 1(|(?:.|\n)+\n)

1st Alternative — matches an empty string

2nd Alternative(?:.|\n)+\n

Non-Capturing Group(?:.|\n)+

+repeats the group contents below at least once:

1st Alternative.

.any character (except for line terminators)

2nd Alternative\n

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

From:the literal text From: (case insensitive)

Character Class[\s\t]*

*matches any number of characters from the set below:

\sany whitespace character

\ta tab character (ASCII 9)

Group 2((?:.|\n)*?)

Non-Capturing Group(?:.|\n)*?

*?repeats the group contents below any number of times:

1st Alternative.

.any character (except for line terminators)

2nd Alternative\n

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

Group 3(|\n\S(?:.|\n)*)

1st Alternative — matches an empty string

2nd Alternative\n\S(?:.|\n)*

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

\Sany non-whitespace character

Non-Capturing Group(?:.|\n)*

*repeats the group contents below any number of times:

1st Alternative.

.any character (except for line terminators)

2nd Alternative\n

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

$end of string, or before its final line terminator

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(|(?:.|\n)+\n)From:[\s\t]*((?:.|\n)*?)(|\n\S(?:.|\n)*)$

New

from: grtrtr
 ghhjjyjkyrur6uy yu6yu