Regular Expressions 101

Save & Share

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
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

# coding=utf8 # the above tag defines encoding for this document and is for Python 2.x compatibility import re regex = r"(?ix)(?>[^\S ]\s*|\s{2,})(?=(?:(?:[^<]++|<(?!\/?(?:textarea|pre)\b))*+)(?:<(?>textarea|pre)\b|\z))" test_str = ("<body>\n" " <section id=\"fd-container\" class=\"bgFFF celupSection\">\n" " <div class=\"container\">\n" " <div class=\"row\">\n" " <div id=\"primary\" class=\"col-md-9 content-area\">\n" " <main id=\"main\" role=\"main\">\n" " <div class=\"table-info\"><span class=\"info\">테이블번호: 13</span></div>\n" " <article id=\"post-445\" class=\"post-content post-445 company type-company status-publish has-post-thumbnail hentry category-32 wpautop\">\n" " <header class=\"entry-header\"><span class=\"screen-reader-text\">할머니잔치국수</span>\n" " <h1 class=\"entry-title\">할머니잔치국수</h1>\n" " </header>\n" " <div class=\"entry-content\">\n" " <div class=\"vc_row wpb_row vc_row-fluid\">\n" " <div class=\"wpb_column vc_column_container vc_col-sm-12\">\n" " <div class=\"vc_column-inner\">\n" " <div class=\"wpb_wrapper\">\n" " <div class=\"wpb_text_column wpb_content_element\">\n" " <div class=\"wpb_wrapper\">\n" " <div class=\"fd-foodDetailProBox style1\">\n" " <ul class=\"fd-foodDetailProList\">\n" " <li class=\"fd-foodDetailPro fd-flex\">\n" " <div class=\"fd-foodDetailProLeft fd-flex\">\n" " <div class=\"fd-foodProLeftTitleBox\">\n" " <div class=\"fd-foodProImg\"><img width=\"66\" height=\"66\" src=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-01-100x100.jpg\" alt=\"\" srcset=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-01-100x100.jpg 100w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-01-150x150.jpg 150w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-01-60x60.jpg 60w\" sizes=\"(max-width: 66px) 100vw, 66px\" class=\"attachment-66x66 size-66x66\" /></div>\n" " </div>\n" " <div class=\"fd-foodProLeftContentBox\">\n" " <div class=\"fd-foodProSubTitle\">비빔국수</div>\n" " <div class=\"fd-foodProLeftContent\">최상의 마법 비빔국수</div>\n" " <div class=\"fd-foodProLeftContent\">영양정보 칼로리 313kcal</div>\n" " </div>\n" " </div>\n" " <div class=\"fd-foodDetailProRight fd-flex fd-align-center fd-justy-center\">\n" " <div class=\"fd-foodDetailProPrice\">4,900</div>\n" " </div>\n" " </li>\n" " <li class=\"fd-foodDetailPro fd-flex\">\n" " <div class=\"fd-foodDetailProLeft fd-flex\">\n" " <div class=\"fd-foodProLeftTitleBox\">\n" " <div class=\"fd-foodProImg\"><img width=\"66\" height=\"66\" src=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-02-100x100.jpg\" alt=\"\" srcset=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-02-100x100.jpg 100w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-02-150x150.jpg 150w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-02-60x60.jpg 60w\" sizes=\"(max-width: 66px) 100vw, 66px\" class=\"attachment-66x66 size-66x66\" /></div>\n" " </div>\n" " <div class=\"fd-foodProLeftContentBox\">\n" " <div class=\"fd-foodProSubTitle\">잔치국수</div>\n" " <div class=\"fd-foodProLeftContent\">할머니의 정성이 잔득 담긴 잔치국수</div>\n" " <div class=\"fd-foodProLeftContent\">영양정보 칼로리 280kcal</div>\n" " </div>\n" " </div>\n" " <div class=\"fd-foodDetailProRight fd-flex fd-align-center fd-justy-center\">\n" " <div class=\"fd-foodDetailProPrice\">4,900</div>\n" " </div>\n" " </li>\n" " <li class=\"fd-foodDetailPro fd-flex\">\n" " <div class=\"fd-foodDetailProLeft fd-flex\">\n" " <div class=\"fd-foodProLeftTitleBox\">\n" " <div class=\"fd-foodProImg\"><img width=\"66\" height=\"66\" src=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-03-100x100.jpg\" alt=\"\" srcset=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-03-100x100.jpg 100w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-03-150x150.jpg 150w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-03-60x60.jpg 60w\" sizes=\"(max-width: 66px) 100vw, 66px\" class=\"attachment-66x66 size-66x66\" /></div>\n" " </div>\n" " <div class=\"fd-foodProLeftContentBox\">\n" " <div class=\"fd-foodProSubTitle\">콩국수</div>\n" " <div class=\"fd-foodProLeftContent\">직접 빚어 만든 콩국수</div>\n" " <div class=\"fd-foodProLeftContent\">영양정보 칼로리 354kcal</div>\n" " </div>\n" " </div>\n" " <div class=\"fd-foodDetailProRight fd-flex fd-align-center fd-justy-center\">\n" " <div class=\"fd-foodDetailProPrice\">5,900</div>\n" " </div>\n" " </li>\n" " <li class=\"fd-foodDetailPro fd-flex\">\n" " <div class=\"fd-foodDetailProLeft fd-flex\">\n" " <div class=\"fd-foodProLeftTitleBox\">\n" " <div class=\"fd-foodProImg\"><img width=\"66\" height=\"66\" src=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-05-100x100.jpg\" alt=\"\" srcset=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-05-100x100.jpg 100w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-05-150x150.jpg 150w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-05-60x60.jpg 60w\" sizes=\"(max-width: 66px) 100vw, 66px\" class=\"attachment-66x66 size-66x66\" /></div>\n" " </div>\n" " <div class=\"fd-foodProLeftContentBox\">\n" " <div class=\"fd-foodProSubTitle\">도토리묵</div>\n" " <div class=\"fd-foodProLeftContent\">깻잎과 도토리묵 환상 컴비네이션</div>\n" " <div class=\"fd-foodProLeftContent\">영양정보 칼로리 423kcal</div>\n" " </div>\n" " </div>\n" " <div class=\"fd-foodDetailProRight fd-flex fd-align-center fd-justy-center\">\n" " <div class=\"fd-foodDetailProPrice\">8,900</div>\n" " </div>\n" " </li>\n" " <li class=\"fd-foodDetailPro fd-flex\">\n" " <div class=\"fd-foodDetailProLeft fd-flex\">\n" " <div class=\"fd-foodProLeftTitleBox\">\n" " <div class=\"fd-foodProImg\"><img width=\"66\" height=\"66\" src=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-04-100x100.jpg\" alt=\"\" srcset=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-04-100x100.jpg 100w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-04-150x150.jpg 150w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-04-60x60.jpg 60w\" sizes=\"(max-width: 66px) 100vw, 66px\" class=\"attachment-66x66 size-66x66\" /></div>\n" " </div>\n" " <div class=\"fd-foodProLeftContentBox\">\n" " <div class=\"fd-foodProSubTitle\">물만두</div>\n" " <div class=\"fd-foodProLeftContent\">한입에 속 식감이 살아 있는 물만두</div>\n" " <div class=\"fd-foodProLeftContent\">영양정보 칼로리 154kcal</div>\n" " </div>\n" " </div>\n" " <div class=\"fd-foodDetailProRight fd-flex fd-align-center fd-justy-center\">\n" " <div class=\"fd-foodDetailProPrice\">6,900</div>\n" " </div>\n" " </li>\n" " <li class=\"fd-foodDetailPro fd-flex\">\n" " <div class=\"fd-foodDetailProLeft fd-flex\">\n" " <div class=\"fd-foodProLeftTitleBox\">\n" " <div class=\"fd-foodProImg\"><img width=\"66\" height=\"66\" src=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-06-100x100.jpg\" alt=\"\" srcset=\"http://webpos.wper.kr/wp-content/uploads/2018/09/1000-06-100x100.jpg 100w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-06-150x150.jpg 150w, http://webpos.wper.kr/wp-content/uploads/2018/09/1000-06-60x60.jpg 60w\" sizes=\"(max-width: 66px) 100vw, 66px\" class=\"attachment-66x66 size-66x66\" /></div>\n" " </div>\n" " <div class=\"fd-foodProLeftContentBox\">\n" " <div class=\"fd-foodProSubTitle\">파전</div>\n" " <div class=\"fd-foodProLeftContent\">군침이 감도는 해물파전</div>\n" " <div class=\"fd-foodProLeftContent\">영양정보 칼로리 654kcal</div>\n" " </div>\n" " </div>\n" " <div class=\"fd-foodDetailProRight fd-flex fd-align-center fd-justy-center\">\n" " <div class=\"fd-foodDetailProPrice\">13,900</div>\n" " </div>\n" " </li>\n" " </ul>\n" " </div>\n" " </div>\n" " </div>\n" " </div>\n" " </div>\n" " </div>\n" " </div>\n" " </div>\n" " </article>\n" " </main>\n" " </div>\n" " </div>\n" " </div>\n" " </section>\n" "</body>") matches = re.finditer(regex, test_str, re.MULTILINE) for matchNum, match in enumerate(matches, start=1): print ("Match {matchNum} was found at {start}-{end}: {match}".format(matchNum = matchNum, start = match.start(), end = match.end(), match = match.group())) for groupNum in range(0, len(match.groups())): groupNum = groupNum + 1 print ("Group {groupNum} found at {start}-{end}: {group}".format(groupNum = groupNum, start = match.start(groupNum), end = match.end(groupNum), group = match.group(groupNum))) # Note: for Python 2.7 compatibility, use ur"" to prefix the regex and u"" to prefix the test string and substitution.

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 Python, please visit: https://docs.python.org/3/library/re.html