regex101: PCRE (Legacy) Match Workspace

1st Alternative(##[^\n]*\n)

Group 1(##[^\n]*\n)

##the literal text ##

Negated Character Class[^\n]*

*matches any number of characters outside the set below:

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

2nd Alternative($(CR|CL) \d+$) ((RM|SM) [0-9]:)

Group 2($(CR|CL) \d+$)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 3(CR|CL)

1st AlternativeCR

CRthe literal text CR (case sensitive)

2nd AlternativeCL

CLthe literal text CL (case sensitive)

the literal (32₁₀ / 40₈ / 20₁₆)

\d+a digit, repeated at least once

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Group 4((RM|SM) [0-9]:)

Group 5(RM|SM)

1st AlternativeRM

RMthe literal text RM (case sensitive)

2nd AlternativeSM

SMthe literal text SM (case sensitive)

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[0-9]

0-9one character from 0 (48₁₀) to 9 (57₁₀)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

3rd Alternative([a-zA-Z!]+(?: [a-zA-Z!]*)*)

Group 6([a-zA-Z!]+(?: [a-zA-Z!]*)*)

Character Class[a-zA-Z!]+

+matches at least one character from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

Non-Capturing Group(?: [a-zA-Z!]*)*

*repeats the group contents below any number of times:

the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[a-zA-Z!]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

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

25 tokens

Regular Expression

(##[^\n]*\n)|(\((CR|CL) \d+\)) ((RM|SM) [0-9]:)|([a-zA-Z!]+(?: [a-zA-Z!]*)*)

New

## (Chat room 1) Received message from client 1: Nice to meet you!
(CR 1) RM 1: Nice to meet you!
(CR 1) SM 1: Nice to meet you!
## (Client 1) Received message from client 1: Nice to meet you!
(CL 1) RM 1: Nice to meet you!
(CR 0) SM 3: Nice to meet you!
## (Client 3) Received message from client 3: Nice to meet you!
(CL 3) RM 3: Nice to meet you!

Substitution

## (Chat room 1) Received message from client 1: Nice to meet you!
(CR 1) RM 1: Nice to meet you!
(CR 1) SM 1: Nice to meet you!
## (Client 1) Received message from client 1: Nice to meet you!
(CL 1) RM 1: Nice to meet you!
(CR 0) SM 3: Nice to meet you!
## (Client 3) Received message from client 3: Nice to meet you!
(CL 3) RM 3: Nice to meet you!