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

/
/
gm

Test String

Code Generator

Language

Generated Code

re = /^(?:SELECT\s+([\s\S]+?)(?=\s+INTO\s+|\s+FROM|$))(?:.*?\s+INTO\s+([\S]+)\s*)?(?:\s+FROM\s+)([\s\S]+?)(?=\s+WHERE\s+|\s+GROUP\sBY\s+|\s+HAVING\s+|\s+ORDER\sBY|$)(?:.*?\s+WHERE\s+([\s\S]+?)(?=\s+GROUP\sBY\s+|\s+HAVING\s+|\s+ORDER\sBY|$))?(?:.*?\s+GROUP\sBY\s+([\s\S]+?)(?=\s+HAVING\s+|\s+ORDER\sBY|$))?(?:.*?\s+HAVING\s+([\s\S]+?)(?=\s+ORDER\sBY\s+|$))?(?:.*?\s+ORDER\sBY\s+([\s\S]+?)(?=\s*$))?$/m str = 'SELECT t1.dummy1, t1.dummy2 AS Error, t1.dummy3 INTO testResult FROM (test1 t1 INNER JOIN test2 t2 ON t1.dummy4 = t2.dummy4) INNER JOIN test3 t3 ON t2.dummy9 = t3.dummy9 WHERE t2.dummy6 = \'abc\' AND t3.dummy10 <> \'def\' AND t1.dummy11 = \'ghi\' AND t2.dummy12 IS NULL GROUP BY t1.dummy1 HAVING 1=1 ORDER BY 1;' # 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