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
Processing...

Test String

Code Generator

Language

Generated Code

import re regex = re.compile(r"(│?\s{3,})*[├└]─{2} ") test_str = ("├── Blog\n" "│ └── _v_images\n" "├── Essay\n" "│ └── Encryption&Trust\n" "├── Hidden\n" "│ └── _v_images\n" "├── Life\n" "│ ├── Cuisine\n" "│ ├── Game\n" "│ ├── Ideas\n" "│ ├── Linguistic\n" "│ │ └── English\n" "│ └── Music\n" "├── Other\n" "│ └── _v_images\n" "├── PWN\n" "│ └── _v_images\n" "├── Programme\n" "│ └── _v_images\n" "├── Work\n" "│ ├── Database\n" "│ ├── GUI\n" "│ │ └── CSS\n" "│ ├── Language\n" "│ │ └── DocString\n" "│ │ └── __pycache__\n" "│ ├── Network\n" "│ ├── OS\n" "│ │ ├── Android\n" "│ │ │ ├── BuildTools\n" "│ │ │ ├── DevTools\n" "│ │ │ ├── Permissions\n" "│ │ │ ├── PropertiesLogs\n" "│ │ │ ├── Signer\n" "│ │ │ │ ├── META-INF\n" "│ │ │ │ └── webview\n" "│ │ │ │ ├── META-INF\n" "│ │ │ │ ├── assets\n" "│ │ │ │ │ └── stored-locales\n" "│ │ │ │ │ └── weblayer\n" "│ │ │ │ ├── lib\n" "│ │ │ │ │ ├── arm64-v8a\n" "│ │ │ │ │ └── armeabi-v7a\n" "│ │ │ │ └── res\n" "│ │ │ │ ├── anim\n" "│ │ │ │ ├── anim-v21\n" "│ │ │ │ ├── animator\n" "│ │ │ │ ├── animator-v21\n" "│ │ │ │ ├── color\n" "│ │ │ │ ├── color-v21\n" "│ │ │ │ ├── color-v23\n" "│ │ │ │ ├── drawable\n" "│ │ │ │ ├── drawable-hdpi-v4\n" "│ │ │ │ ├── drawable-ldrtl-hdpi-v17\n" "│ │ │ │ ├── drawable-ldrtl-v17\n" "│ │ │ │ ├── drawable-ldrtl-xhdpi-v17\n" "│ │ │ │ ├── drawable-ldrtl-xxhdpi-v17\n" "│ │ │ │ ├── drawable-ldrtl-xxxhdpi-v17\n" "│ │ │ │ ├── drawable-night-hdpi-v8\n" "│ │ │ │ ├── drawable-night-v8\n" "│ │ │ │ ├── drawable-night-xhdpi-v8\n" "│ │ │ │ ├── drawable-night-xxhdpi-v8\n" "│ │ │ │ ├── drawable-night-xxxhdpi-v8\n" "│ │ │ │ ├── drawable-v21\n" "│ │ │ │ ├── drawable-v23\n" "│ │ │ │ ├── drawable-v4\n" "│ │ │ │ ├── drawable-xhdpi-v4\n" "│ │ │ │ ├── drawable-xxhdpi-v4\n" "│ │ │ │ ├── drawable-xxxhdpi-v4\n" "│ │ │ │ ├── font\n" "│ │ │ │ ├── interpolator\n" "│ │ │ │ ├── interpolator-v21\n" "│ │ │ │ ├── layout\n" "│ │ │ │ ├── layout-land\n" "│ │ │ │ ├── layout-v21\n" "│ │ │ │ ├── layout-v22\n" "│ │ │ │ ├── layout-v26\n" "│ │ │ │ ├── menu\n" "│ │ │ │ ├── raw\n" "│ │ │ │ └── xml\n" "│ │ │ └── UID\n" "│ │ └── Linux\n" "│ ├── Presentation\n" "│ │ ├── Diagram\n" "│ │ ├── Slides\n" "│ │ │ └── images\n" "│ │ └── Writing\n" "│ ├── Project\n" "│ ├── RE\n" "│ ├── Service\n" "│ ├── Tool\n" "│ │ ├── Diff\n" "│ │ ├── File\n" "│ │ ├── Frida\n" "│ │ │ └── scripts\n" "│ │ ├── Git\n" "│ │ ├── IO\n" "│ │ ├── Shell\n" "│ │ └── Text\n" "│ └── Virtualization\n" "│ └── Docker\n" "└── 随笔\n" " └── _v_images") matches = regex.finditer(test_str) for match_num, match in enumerate(matches, start=1): print(f"Match {match_num} was found at {match.start()}-{match.end()}: {match.group()}") for group_num, group in enumerate(match.groups(), start=1): print(f"Group {group_num} found at {match.start(group_num)}-{match.end(group_num)}: {group}")

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