Regular Expressions 101

Explanation

Pro

\ban ASCII word boundary

Group 1((?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:(?<!\.)\b|\.)){4}

{4}repeats the group contents below exactly 4 times:

Non-Capturing Group(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)

1st Alternative25[0-5]

25the literal text 25

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

2nd Alternative2[0-4][0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-4]

0-4one character from 0 (48₁₀) to 4 (52₁₀)

Character Class[0-9]

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

3rd Alternative[01]?[0-9][0-9]?

Character Class[01]?

?matches at most one character from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

Character Class[0-9]?

?matches at most one character from the set below:

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

Non-Capturing Group(?:(?<!\.)\b|\.)

1st Alternative(?<!\.)\b

Negative Lookbehind(?<!\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\ban ASCII word boundary

2nd Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

\b((?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(?:(?<!\.)\b|\.)){4}

New

#Ejemplos de codigo fuente del lenguaje de programacion Ruby

#Aritmetica basica
resultado='5 * (12 - 8) + -15'
puts resultado
puts 98 + (59872 / (13 * 8)) * -52

#Textos
puts "Hola, mundo!"
puts ""
puts "Adiós."
puts "Me gusta" + "el pastel de manzana."
puts "Mi IP es: 192.168.9.10"
puts "ragustin726@gmail.com"
puts "https://www.facebook.com"
puts "31/01/2021/"

277.893.21.2

#Variables
myString = '...puedes decir eso de nuevo...'
puts myString
name = 'Patricia Rosanna Jessica Mildred Oppenheimer'
ip= 10.0.0.1
correo='roberto_840@hotmail.com'
direccion='https://www.google.com'
fecha = '19/07/2001'

#Concatenaciones
puts 'Me llamo ' + name + '.'
puts 'Wow!  "' + name + '" es un nombre realmente largo!'
composer1 = 'Mozart'
puts composer1 + ' fue "el amo", en su día.'
composer = 'Beethoven'
puts 'Pero yo prefiero a ' + composer1 + ', personalmente.'

#Conversiones
var1 = 2
var2 = '5'
puts var1.to_s + var2
var1 = 2
var2 = '5'
puts var1.to_s + var2
puts var1 + var2.to_i

#Condicionales 
p