Regular Expressions 101

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An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
g

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

re = /.+?snuffs out the (\d+).. fire pit, and in seconds.+/ str = '\\#58FAACQaaron snuffs out the 1st fire pit, and in seconds the connecting bridge will also be extinguished! \\#58FAACQaaron snuffs out the 2nd fire pit, and in seconds the connecting bridge will also be extinguished! \\#58FAACQaaron snuffs out the 3rd fire pit, and in seconds the connecting bridge will also be extinguished! \\#58FAACQaaron snuffs out the 4th fire pit, and in seconds the connecting bridge will also be extinguished! \\#58FAACQaaron snuffs out the 5th fire pit, and in seconds the connecting bridge will also be extinguished! \\#58FAACQaaron snuffs out the 6th fire pit, and in seconds the connecting bridge will also be extinguished! \\#58FAACQaaron snuffs out the 7th fire pit, and in seconds the connecting bridge will also be extinguished! \\#58FAACQaaron snuffs out the 8th fire pit, and in seconds the connecting bridge will also be extinguished! \\#58FAACQaaron snuffs out the 9th fire pit, and in seconds the connecting bridge will also be extinguished! \\#58FAACQaaron snuffs out the 10th fire pit, and in seconds the connecting bridge will also be extinguished!' subst = 'Bridge $1' result = str.gsub(re, subst) # Print the result of the substitution puts result

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html