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

r"
"
ig

Test String

Code Generator

Language

Generated Code

re = /(?i)VITA?MIN\s*C##.*?##[0-9]+ days/i str = '1. As VITMINC##1-0-1##1 days.As 2. amlodipine ##vitamin c##diclo##tabramycin eye drop##metformin##0-0-1##15 days. amlodipine ##1-0-1## 3 days. 3. Xylometazoline(P) Nasal drops##0-1-0##2 days. Paracetamol 500mg tab##0.5-0-0-0##2 days. VITMINC##0.5-0-0##2 days. Chlorpheniramine maleate 4mg tab##0-1-0##2 days. 4. VITMINC##0-0-0-1##2 days. 5. amlodipine##vitamin c##diclo##tabramycin eye drop##metformin##0-0-1##15 days.' # Print the match result str.scan(re) do |match| puts match.to_s end

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