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"! ElectricEIRChiller (?P<Brand>\w+) (?P<Model>\w+) (?P<kW>\d+)kW\/(?P<COP>.*?)COP\/(?P<Type>\w+)\n! Manufacturer = (?P<Brand2>.*?), Model Line = (?P<Model_Line>.*?)\n! Reference Capacity = (?P<kW2>.*?) kW \((?P<tons>.*?) tons\)\n! Compressor Type = (?P<compressor_type>.*?), Condenser Type = (?P<condenser_type>.*?)\n! Refrigerant = (?P<refrigerant>.*?), Voltage & Phase = (?P<Voltage>.*?)V-(?P<phase>.*?)PH-(?P<hertz>.*?)Hz\n! Unloading Mechanism = (?P<unloading_mech>.*?)\n", flags=re.MULTILINE | re.DOTALL) test_str = ("! ElectricEIRChiller Carrier 19XR 1758kW/5.86COP/VSD\n" "! Manufacturer = Carrier, Model Line = 19XR\n" "! Reference Capacity = 1758 kW (500 tons)\n" "! Compressor Type = Centrifugal, Condenser Type = Water\n" "! Refrigerant = R-134a, Voltage & Phase = 460V-3PH-60Hz\n" "! Unloading Mechanism = VSD\n" "!\n\n" " Chiller:Electric:EIR,\n" " ElectricEIRChiller Carrier 19XR 1758kW/5.86COP/VSD, !- Name\n" " 1758300, !- Reference Capacity {W}\n" " 5.86, !- Reference") match = regex.search(test_str) if match: print(f"Match 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