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 single character of: a, b, c or d
    [[ab][cd]]
  • 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]
  • Character class intersection
    [\w&&[^\d]]
  • 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

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"(\d+[-|/]\d+[-|/]\d+\s\S+)\s+(\w+)\s+([^:]+):\s+(.+)*"; string input = @"2023-02-23 19:27:02 WARN SparkDriver(183): 是否使用testGo模式？false testGo模式下忽略命令行-b参数. 2023-02-23 19:27:02 WARN SparkDriver(359): 命令行参数(cmdOption):{a=de_boardHistory, b=boardHistory, g=[loadToAdb=false, upsert=true, etlDate=20230222], w=null} 2023-02-23 19:27:02 INFO ConfigOption(111): 加载本地配置文件(local.config)，覆盖项目配置 2023-02-23 19:27:02 INFO ConfigOption(78): 提取命令行(cmdOption)相同key，覆盖项目配置 2023-02-23 19:27:02 WARN SparkDriver(183): 项目配置(configOption)重要参数:{cluster=true, test=false, projectName=ATLAS-ETL... 23/02/23 20:03:25 WARN [Driver] SparkUtil: /---------------------------------------* 23/02/23 20:03:25 WARN [Driver] SparkUtil: * SparkDiver * 23/02/23 20:03:25 WARN [Driver] SparkUtil: * <spark-2.4.7, scala-2.11> * 23/02/23 20:03:25 WARN [Driver] SparkUtil: *---------------------------------------*/ 23/02/23 20:03:25 INFO [Driver] SparkUtil: init spark... 23/02/23 20:03:25 INFO [Driver] SparkUtil: localTest: false"; RegexOptions options = RegexOptions.Multiline; foreach (Match m in Regex.Matches(input, pattern, options)) { Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index); } } }

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 C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx