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 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

/
/
g

Test String

Substitution

Processing...

Code Generator

Generated Code

using System; using System.Text.RegularExpressions; public class Example { public static void Main() { string pattern = @"""(?=(?:(?:[^<](?!%>))*(?:<%[^%]+%>)(?:[^<](?!%>))*)*$)"; string substitution = @"#"; string input = @"select ""SomethingQuoted"", ""SomethingQuoted"" , ""SomethingQuoted"" , ""SomethingQuoted"" to_char(max(decode( landing_name,'DX_L_MDC_RDM', BATCH_ID , -1))) as MDC_RDM_BATCH_ID ,to_char(max(decode( landing_name,'DX_L_ESB_SPARK', BATCH_ID , -1))) as ESB_SPARK_BATCH_ID from ( select max(u.batch_id) as BATCH_ID , u.landing_name from ""<%=odiRef.getSchemaName(""DJC_METADATA"",""D"")%> .u$dx_batch_log u ""SomethingQuoted"" join <%=odiRef.getSchemaName(""DJC_METADATA"",""D"")%> .djc$dx_landing la on u.landing_name = la.landing_name and u.batch_id >= la.last_deleted_batch_id join <%=odiRef.getSchemaName(""DJC_METADATA"",""D"")%> .djc$load_log lo on u.load_id = lo.load_id and lo.status = 'COMPLETE' and lo.load_id > 0 ""SomethingQuoted"" ""SomethingQuoted"" where u.landing_name in ('DX_L_MDC_RDM', 'DX_L_ESB_SPARK') and u.chkp_status = 'FINISHED' group by u.landing_name ) ""<%=="" ""=%> "; Regex regex = new Regex(pattern); string result = regex.Replace(input, substitution); } }

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