Regular Expressions 101

Pro

Group 1(Test|Hello)

1st AlternativeTest

Testthe literal text Test (case insensitive)

2nd AlternativeHello

Hellothe literal text Hello (case insensitive)

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

Group 2([^:]*)

Negated Character Class[^:]*

*matches any number of characters outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

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

Group 3(\n.*?)

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

.*?any character, repeated any number of times

Positive Lookahead(?=Test[^:]*:|Hello[^:]*:|$)

1st AlternativeTest[^:]*:

Testthe literal text Test (case insensitive)

Negated Character Class[^:]*

*matches any number of characters outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

2nd AlternativeHello[^:]*:

Hellothe literal text Hello (case insensitive)

Negated Character Class[^:]*

*matches any number of characters outside the set below:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

3rd Alternative$

$end of string, or before its final line terminator

Global pattern flags

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

s modifier: single line. Allows a dot to match line terminators

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

Detailed match information will be displayed here automatically.

25 tokens

(Test|Hello)\s*([^:]*):\n(\n.*?)(?=Test[^:]*:|Hello[^:]*:|$)

New

Test 123:

This is a blue car

Test:

This car is not blue

This car is yellow

Hello:

This is not a test

Test 123:

This is a blue car

Test:

This car is not blue

This car is yellow

Hello:

This is not a test