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]
  • Character class intersection
    [\w&&[^\d]]
  • 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
Processing...

Test String

Substitution
Processing...

Code Generator

Language

Generated Code

$re = '/<td>Montana<\/td><\/tr><tr><th>County<\/th><td>Beaverhead<\/td><\/tr><tr><th>Radon<\/th><td>3<\/td><\/tr><tr><th>GIS<\/th><td><a href="https:\/\/publicrecords\.netronline\.com\/state\/MT\/county\/beaverhead\/">Link<\/a><\/td><\/tr><\/table><\/body>]]><\/description>\n\s+<styleUrl>#z3<\/styleUrl>/m'; $str = '<td>Montana</td></tr><tr><th>County</th><td>Beaverhead</td></tr><tr><th>Radon</th><td>3</td></tr><tr><th>GIS</th><td><a href="https://publicrecords.netronline.com/state/MT/county/beaverhead/">Link</a></td></tr></table></body>]]></description> <styleUrl>#z3</styleUrl> (<\\/s\\S{8}\\n\\s{16}<E\\S{12}\\n\\s{20}<S\\S{9}\\s\\S{34}\\n\\s{24}<S\\S{9}\\s\\S{31}\\n\\s{24}<S\\S{9}\\s\\S{13}>)(Atoska)(<\\S{13}\\n\\s{24}<\\S{9}\\s\\S{11}>1)'; $subst = "$12$2$3$4$5$62"; $result = preg_replace($re, $subst, $str); echo "The result of the substitution is ".$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 PHP, please visit: http://php.net/manual/en/ref.pcre.php