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

/
/

Test String

Substitution

Processing...

Code Generator

Language

Generated Code

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r"(\/\/ \[\'administrator_start\'\])(.|\n)*(\/\/ \[\'administrator_end\'\])").unwrap(); let string = " // ['administrator_start'] if ($_SESSION[\"user_group_short\"] == \"administrator\" && $_SESSION['active'] == 1) { // // //Группа administrator // // ?> <div> Администратор </div> <div id=\"databoard\"> <?php function showTree($folder) { /* Получаем полный список файлов и каталогов внутри $folder */ $files = scandir($folder); foreach ($files as $file) { /* Отбрасываем текущий и родительский каталог */ if (($file == '.') || ($file == '..')) { continue; } $f0 = $folder . '/' . $file; //Получаем полный путь к файлу /* Если это директория */ if (is_dir($f0)) { /* Выводим, делая заданный отступ, название директории */ echo \"<p>\" . translate(iconv(mb_detect_encoding($file, mb_detect_order(), true), \"UTF-8\", $file)) . \"</p>\"; /* С помощью рекурсии выводим содержимое полученной директории */ showTree($f0); } else { /* Если это файл, то просто выводим название файла */ $name_page = explode(\".\", iconv(mb_detect_encoding($file, mb_detect_order(), true), \"UTF-8\", $file)); echo \"<a style='text-decoration: none;' href='\" . iconv(mb_detect_encoding($f0, mb_detect_order(), true), \"UTF-8\", $f0) . \"'>\" . translate($name_page[0]) . \"</a> \"; } } } showTree(\"../pages/\" . $_SESSION['user_group_short']); ?> </div> <?php } // ['administrator_end'] // ['insert_body']"; let substitution = ""; // result will be a String with the substituted value let result = regex.replace(string, substitution); println!("{}", 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 Rust, please visit: https://docs.rs/regex/latest/regex/