Regular Expressions 101

Save & Share

  • Regex Version: ver. 1
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

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
No Match

/
/
g

Test String

Code Generator

Language

Generated Code

import Foundation let pattern = #"Vortag<\/td>.*?\n?.*?<td>(-?\d+\.?\d+)<"# let regex = try! NSRegularExpression(pattern: pattern) let testString = #""" <div id="divInfo" class="cInfo"> <table border="0" cellspacing="0" cellpadding="0" width="100%" height="100%"> <tr> <td align="center"> <table class="tablebody" border="0" width="100%"> <tr> <td class="cNavInfo">Online-Werte &raquo; Wechselrichter-Übersicht</td> </tr> </table> </td> </tr> <tr><td>&nbsp;</td></tr> <tr> <td class="tablebody"> <table width="100%" border="0"> <tr class="tablehead"> <td colspan="7"><strong>Summe aller Wechselrichter</strong></td> </tr> <tr> <td class="tablehead">Bezeichnung</td> <td class="tablehead">Wert</td> <td class="tablehead">Einheit</td> <td>&nbsp;</td> <td class="tablehead">Bezeichnung</td> <td class="tablehead">Wert</td> <td class="tablehead">Einheit</td> </tr> <tr> <td>Aktuelle Leistung</td> <td><b>8.404</b></td> <td>kW</td> <td>&nbsp;</td> <td>Aktuelle Monatsenergie</td> <td>1750.106</td> <td>kWh</td> </tr> <tr> <td>Aktuelle Tagesenergie</td> <td><b>15.328</b></td> <td>kWh</td> <td>&nbsp;</td> <td>Aktuelle Jahresenergie</td> <td>2352.722</td> <td>kWh</td> </tr> <tr> <td>Tagesenergie Vortag</td> <td>148.736</td> <td>kWh</td> <td>&nbsp;</td> <td>Gesamtenergie</td> <td>235217.714</td> <td>kWh</td> </tr> </table> </td> </tr> <tr><td>&nbsp;</td></tr> <tr> <td> <table width="100%" border="0" class="tablebody"> <tr class="tablehead"> <td colspan="5"><strong>Übersicht einzelner Wechselrichter</strong></td> </tr> <tr class="tablehead"> <td width="10%">Adresse</td> <td width="10%">Leistung</td> <td width="15%">Einheit</td> <td width="10%">Tagesenergie</td> <td width="55%">Einheit</td> </tr> <tr><td CLASS="cLink"><A HREF="/httpGpmGotoWrID.cgi?0">1</A></td><td>2505</td><td>W</td><td>4.536</td><td>kWh</td></tr><tr><td CLASS="cLink"><A HREF="/httpGpmGotoWrID.cgi?1">2</A></td><td>2552</td><td>W</td><td>4.880</td><td>kWh</td></tr><tr><td CLASS="cLink"><A HREF="/httpGpmGotoWrID.cgi?2">3</A></td><td>693</td><td>W</td><td>1.304</td><td>kWh</td></tr><tr><td CLASS="cLink"><A HREF="/httpGpmGotoWrID.cgi?3">4</A></td><td>2524</td><td>W</td><td>4.608</td><td>kWh</td></tr> </table> </td> </tr> <tr><td>&nbsp;</td></tr> <tr><td align="center">&nbsp;</td></tr> <tr><td>&nbsp;</td></tr> <tr><td align="center">&nbsp;</td></tr> <tr><td height="100%">&nbsp;</td></tr> <tr> <td align="center"> <table width="100%" border="0" class="tablebody"> <tr> <td>Anmerkung: Die hervorgehobenen Werte werden alle 20s aktualisiert.</td> </tr> </table> </td> </tr> <tr><td>&nbsp;</td></tr> <tr><td>&nbsp;</td></tr> </table> <div class="x-align-right"> <div class="cStatuszeile">&nbsp;Systemzeit&nbsp;&nbsp;10:35:57 / 24.02.2018&nbsp;</div> </div> </div> </body> </html> """# let stringRange = NSRange(location: 0, length: testString.utf16.count) let matches = regex.matches(in: testString, range: stringRange) var result: [[String]] = [] for match in matches { var groups: [String] = [] for rangeIndex in 1 ..< match.numberOfRanges { let nsRange = match.range(at: rangeIndex) guard !NSEqualRanges(nsRange, NSMakeRange(NSNotFound, 0)) else { continue } let string = (testString as NSString).substring(with: nsRange) groups.append(string) } if !groups.isEmpty { result.append(groups) } } print(result)

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 Swift 5.2, please visit: https://developer.apple.com/documentation/foundation/nsregularexpression