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

Substitution

Processing...

Code Generator

Language

Generated Code

$re = '/(<p>[^<]*\{.*<\/p>)/m'; $str = '<p>While orthotic inserts are able to provide great support and pain relief, they aren’t quite as good as a specialty shoe. Remember that an ill-fitting insert can cause permanent damage and talk to a podiatrist about your foot pain for the best recommendation. Click here&nbsp;if you want to learn more about pain in the foot arch unrelated to plantar fasciitis.</p> <h2>Related Posts</h2> <h2>So What Are These Socks Really Good For?</h2> <h2>Are the bottom of your feet causing you problems?</h2> <h2>A PF Relief Guide</h2> <h2>What is Foot Reflexology &amp; What is it Good For?</h2> <h2>Leave a Reply Cancel reply</h2> <p>Your email address will not be published. Required fields are marked *</p> <p>Name</p> <p>Email</p> <p>Website</p> <p>five &nbsp;−&nbsp; &nbsp;=&nbsp; 2 .hide-if-no-js { display: none !important; } </p><h2>Food For Thought January 2016</h2> <h2>Show Us Some Social Love!!</h2> <h2>Recent Posts</h2> <li> The Climate Pledge of Resistance</li> <li> Green Activism in Boulder, Colorado</li> <li> The Truth About Money and Happiness</li> <li> Why Is There So Much Skepticism About Climate Change?</li> <li> Which Device Would Work Best For You?</li>'; $subst = ""; $result = preg_replace($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