Regular Expressions 101

Save & Manage Regex

  • Current Version: 1
  • Save & Share
  • Community Library

Flavor

  • PCRE2 (PHP)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java
  • .NET 7.0 (C#)
  • Rust
  • PCRE (Legacy)
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests
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
Processing...

Test String

Code Generator

Language

Generated Code

import re regex = re.compile(r"(B\d{2}\w{7})") test_str = ("\n" " User account\n" " Research\n" "Bestseller\n" "Watchlist\n" " Monitoring\n" " User List\n" " Dashboard\n" " Log out\n" " Feedback\n" " Add product(s)\n" "Filters\n" "Marketplace\n\n" "Category\n\n" "Title contains\n\n" "Title contains\n" "Tag equals\n\n" "Tag equals\n" "Brand equals\n\n" "Brand equals\n" "Seller equals\n\n" "Seller equals\n" "Buybox\n\n" "Buybox\n" " Amazon\n\n" " FBA\n\n" " FBM\n\n" "Per page\n\n" "Compare\n\n" "Total products: 20\n" "Previous 1 Next\n" " Fav. Image MP Title\n" "ASIN\n" "Brand Price Sales rank\n" "Category Buybox # Sellers # Reviews\n" "Rating LQI Options\n" " \n" "Sternenlichter Sternenhimmel 500 Leuchtpunkte\n\n" "B019HAY3C4\n\n" "Sternenlichter\n\n\n" "€ 12.99 \n" "128075\n" "Küche & Haushalt\n\n" "FBA\n\n" "FRIES Digital\n\n" "1 \n" "49\n\n" "4.1 90 \n" " \n" "Bentgo - Bento Box / Lunchbox inkl. Besteck (Lila)\n\n" "B00B78W282\n\n" "Bentgo\n\n\n" "€ 17.90 \n" "10093\n" "Küche & Haushalt\n\n" "FBA\n\n" "use-again\n\n" "3 \n" "99\n\n" "4.3 75 \n" " \n" "Bentgo - Bento Box / Lunchbox inkl. Besteck (Grün)\n\n" "B00B78WO3U\n\n" "Bentgo\n\n\n" "€ 17.90 \n" "11190\n" "Küche & Haushalt\n\n" "FBA\n\n" "use-again\n\n" "1 \n" "99\n\n" "4.3 75 \n" " \n" "Bentgo - Bento Box / Lunchbox inkl. Besteck (Blau)\n\n" "B00B78T8U2\n\n" "Bentgo\n\n\n" "€ 17.90 \n" "10560\n" "Küche & Haushalt\n\n" "FBA\n\n" "use-again\n\n" "2 \n" "99\n\n" "4.3 75 \n" " \n" "Bentgo - Bento Box / Lunchbox inkl. Besteck (Grau)\n\n" "B00B78UBO4\n\n" "Bentgo\n\n\n" "€ 17.90 \n" "2658\n" "Küche & Haushalt\n\n" "FBA\n\n" "use-again\n\n" "2 \n" "99\n\n" "4.3 75 \n" " \n" "Emsa 516943 3-teiliges Frischhaltedosenset, 1 Liter, Transparent/Blau, Clip & Close\n\n" "B004QGXKRO\n\n" "Emsa\n\n\n" "€ 11.79 \n" "433\n" "Küche & Haushalt\n\n" "Amazon\n\n" "40 \n" "297\n\n" "4.6 90 \n" " \n" "Meal Prep Haven Lebensmittelbehälter mit 2 Fächern und Deckeln für die Portionskontrolle, ...\n\n" "B011SUKOHE\n\n" "Meal Prep Haven\n\n" "box \n\n" "463636\n" "Küche & Haushalt\n\n" "1 \n" "25 \n" " \n" "Mikrowelle und spülmaschinenfest stapelbar Mahlzeit Prep Kunststoff Lebensmittel Behälter ...\n\n" "B0195971NU\n\n" "Superior\n\n" "box \n\n" "€ 16.49 \n" "15941\n" "Küche & Haushalt\n\n" "FBA\n\n" "K Master\n\n" "1 \n" "40\n\n" "3.9 65 \n" " \n" "Mikrowelle und spülmaschinenfest stapelbar Mahlzeit Prep Kunststoff Lebensmittel Behälter ...\n\n" "B01BCNFT3Q\n\n" "Superior\n\n" "box \n\n" "€ 16.89 \n" "11542\n" "Küche & Haushalt\n\n" "FBA\n\n" "K Master\n\n" "1 \n" "40\n\n" "3.9 65 \n" " \n" "Mikrowelle und spülmaschinenfest stapelbar Mahlzeit Prep Kunststoff Lebensmittel Behälter ...\n\n" "B017KNFDOM\n\n" "Superior\n\n" "box \n\n" "€ 16.89 \n" "3630\n" "Küche & Haushalt\n\n" "FBA\n\n" "K Master\n\n" "2 \n" "40\n\n" "3.9 55 \n" " \n" "Meal Prep Haven Lebensmittelbehälter mit 3 Fächern und Deckeln für die Portionskontrolle, ...\n\n" "B011SY4P9I\n\n" "Meal Prep Haven\n\n" "box \n\n" "46144\n" "Küche & Haushalt\n\n" "1 \n" "4\n\n" "3.3 40 \n" " \n" "XL Silikon Backmatte von Cookin´Active, BPA frei, Platinum Silikon, Lebensmittelecht, Anti ...\n\n" "B01AR1L0FU\n\n" "Cookin'Active\n\n\n" "€ 17.99 \n" "3234\n" "Küche & Haushalt\n\n" "FBA\n\n" "Flatland Trading\n\n" "1 \n" "35\n\n" "5 90 \n" " \n" "WENKO 4374120100 Wäschesortierer Air - 6 breite Fächer, 100 % Polypropylen, 30 x 120 x 30 ...\n\n" "B0034KYP1I\n\n" "Wenko\n\n" "hängeregal \n\n" "€ 9.99 \n" "2669\n" "Küche & Haushalt\n\n" "Amazon\n\n" "5 \n" "57\n\n" "4.2 65 \n" " \n" "WENKO 64004100 Multi-Organizer Butterfly - 10 Fächer, 100% Polypropylen, 15 x 127 x 30 cm, ...\n\n" "B00URLQRMW\n\n" "Wenko\n\n" "hängeregal \n\n" "€ 11.99 \n" "451701\n" "Küche & Haushalt\n\n" "Amazon\n\n" "4 \n" "45 \n" " \n" "Metaltex 751016 Hängeregal, 10 Fächer, 20 x 29 x 120 cm\n\n" "B0098UXD3O\n\n" "Metaltex\n\n" "hängeregal \n\n" "€ 14.07 \n" "357099\n" "Küche & Haushalt\n\n" "Amazon\n\n" "1 \n" "20 \n" " \n" "Chintz, Vintage-Stil gemustert, 10 Taschen für Schuh-Aufbewahrung\n\n" "B00KD875RU\n\n" "Lloyd Pascal\n\n" "hängeregal \n\n" "€ 9.49 \n" "1540117\n" "Küche & Haushalt\n\n" "FBA\n\n" "ramsdensdirect\n\n" "2 \n" "20 \n" " \n" "WENKO 4372030100 Multiorganizer Comfort - 10 Fächer, Kunststoff - PEVA, 15 x 122 x 30 cm, ...\n\n" "B001AI590W\n\n" "Wenko\n\n" "hängeregal \n\n" "€ 9.99 \n" "34405\n" "Küche & Haushalt\n\n" "Amazon\n\n" "3 \n" "11\n\n" "3.9 20 \n" "Delete selected products\n" "Previous 1 Next\n" "Copyright © 2016 AMALYTIX.COM") 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