Regular Expressions 101

1st Alternative((^|\s)#(.*)$)

Group 1((^|\s)#(.*)$)

Group 2(^|\s)

1st Alternative^

^start of line

2nd Alternative\s

\sany whitespace character

#the literal # (35₁₀ / 43₈ / 23₁₆)

Group 3(.*)

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

$end of line

2nd Alternative(^\n)

Group 4(^\n)

^start of line

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

3rd Alternative(\n(\s|)+#(.*)$)

Group 5(\n(\s|)+#(.*)$)

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

Group 6(\s|)+

+repeats the group contents below at least once:

1st Alternative\s

\sany whitespace character

2nd Alternative — matches an empty string

#the literal # (35₁₀ / 43₈ / 23₁₆)

Group 7(.*)

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

$end of line

4th Alternative([\n\s]+#.*)

Group 8([\n\s]+#.*)

Character Class[\n\s]+

+matches at least one character from the set below:

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

\sany whitespace character

#the literal # (35₁₀ / 43₈ / 23₁₆)

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

5th Alternative([\n\s]{2,}$)

Group 9([\n\s]{2,}$)

Character Class[\n\s]{2,}

{2,}matches at least 2 characters from the set below:

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

\sany 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.

Search reference

Regular Expression

((^|\s)#(.*)$)|(^\n)|(\n(\s|)+#(.*)$)|([\n\s]+#.*)|([\n\s]{2,}$)

Test String
New

#This RegEx removes inline comments and blank lines in python code!

# This will save you tokens and time when using GPT to help code and debug.


import requests
import os


#Define vars
def add(a, b):
    return a + b
# print results
result = add(2, 3)
print(result) # Output: 5
print("Complete")

Regular Expression

Test StringNew

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Test String
New

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