regex101: Python Match Workspace

^start of line

Non-Capturing Group(?:\t| )*

*repeats the group contents below any number of times:

1st Alternative\t

\ta tab character (ASCII 9)

2nd Alternative

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:#|%|;|//|--|REM|C|!)

1st Alternative#

#the literal # (35₁₀ / 43₈ / 23₁₆)

2nd Alternative%

%the literal % (37₁₀ / 45₈ / 25₁₆)

3rd Alternative;

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

4th Alternative//

//the literal text //

5th Alternative--

--the literal text --

6th AlternativeREM

REMthe literal text REM (case sensitive)

7th AlternativeC

Cthe literal C (67₁₀ / 103₈ / 43₁₆) (case sensitive)

8th Alternative!

!the literal ! (33₁₀ / 41₈ / 21₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:#{64} (.*)|#{32} (.*)|#{16} (.*)|#{8} (.*)|#{4} (.*)|#{2} (.*))

1st Alternative#{64} (.*)

#{64}the literal # (35₁₀ / 43₈ / 23₁₆) , repeated exactly 64 times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 1(.*)

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

2nd Alternative#{32} (.*)

#{32}the literal # (35₁₀ / 43₈ / 23₁₆) , repeated exactly 32 times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 2(.*)

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

3rd Alternative#{16} (.*)

#{16}the literal # (35₁₀ / 43₈ / 23₁₆) , repeated exactly 16 times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 3(.*)

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

4th Alternative#{8} (.*)

#{8}the literal # (35₁₀ / 43₈ / 23₁₆) , repeated exactly 8 times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 4(.*)

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

5th Alternative#{4} (.*)

#{4}the literal # (35₁₀ / 43₈ / 23₁₆) , repeated exactly 4 times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 5(.*)

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

6th Alternative#{2} (.*)

#{2}the literal # (35₁₀ / 43₈ / 23₁₆) , repeated exactly 2 times

the literal (32₁₀ / 40₈ / 20₁₆)

Group 6(.*)

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

$end of line

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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

25 tokens

Regular Expression

^(?:\t| )*(?:#|%|;|//|--|REM|C|!) (?:#{64} (.*)|#{32} (.*)|#{16} (.*)|#{8} (.*)|#{4} (.*)|#{2} (.*))$

New

Valid comments that start with "#":

# ################################################################ First Level
# ################################ Second Level
# ################ Third level
# ######## Fourth Level
# #### Fifth level
# ## Sixth level

Valid comments that start with different characters:

// ################################################################ 1st Level
; ################################ 2nd Level
REM ################ 3rd level
C ######## 4th Level
% #### 5th level
-- ## 6th level

Valid comments that start with spaces or tabs:
	# ################################################################ 1st level
        ; ################################ 2nd Level

Invalid comments:

################################################################ No initial character
; ################################################ Hashes not a power of 2
@ ################ Character not recognized
C ########No space after hashes
% %%%%%%%% No hashes
.    # #### Period before spaces
	;#### No space after character

Regular Expressions 101

Regular Expression

Extraction