Regular Expressions 101

Group 1((.*>.*)|(.*(On).*(wrote:)$)|(.*(Date):.*(\+\d\d\d\d)?$)|(.*(From):.*(\.com)?(\]|>)?$))

1st Alternative(.*>.*)

Group 2(.*>.*)

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

>the literal > (62₁₀ / 76₈ / 3E₁₆)

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

2nd Alternative(.*(On).*(wrote:)$)

Group 3(.*(On).*(wrote:)$)

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

Group 4(On)

Onthe literal text On (case sensitive)

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

Group 5(wrote:)

wrote:the literal text wrote: (case sensitive)

$end of string, or before its final line terminator

3rd Alternative(.*(Date):.*(\+\d\d\d\d)?$)

Group 6(.*(Date):.*(\+\d\d\d\d)?$)

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

Group 7(Date)

Datethe literal text Date (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

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

Group 8(\+\d\d\d\d)?

?repeats the group contents below at most once:

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

\da digit

$end of string, or before its final line terminator

4th Alternative(.*(From):.*(\.com)?(\]|>)?$)

Group 9(.*(From):.*(\.com)?(\]|>)?$)

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

Group 10(From)

Fromthe literal text From (case sensitive)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

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

Group 11(\.com)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

Group 12(\]|>)?

?repeats the group contents below at most once:

1st Alternative\]

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

2nd Alternative>

>the literal > (62₁₀ / 76₈ / 3E₁₆)

$end of string, or before its final line terminator

No unit tests · Add a test to get started

Search reference

Regular Expression

((.*>.*)|(.*(On).*(wrote:)$)|(.*(Date):.*(\+\d\d\d\d)?$)|(.*(From):.*(\.com)?(\]|>)?$))

Unit Tests

There are no unit tests, click to add some.