Regular Expressions 101

Pro

^start of line

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

\ban ASCII word boundary

Onthe literal text On (case sensitive)

\ban ASCII word boundary

Character Class[\s\S]*

*matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

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

wrote:the literal text wrote: (case sensitive)

Character Class[\s\S]*

*matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

$end of line

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

^\s*\bOn\b[\s\S]*\nwrote:[\s\S]*$

This is my reply

On Wed, Jun 23, 2021 at 3:22 PM A User (User) <user@mygmailaccount.com>
wrote:
> hello this is my initial email.
>
>

This is my reply

On Wed, Jun 23, 2021 at 3:22 PM A User (User) <user@mygmailaccount.com>
wrote:
> hello this is my initial email.
>
>