Regular Expressions 101

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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

// include the latest version of the regex crate in your Cargo.toml extern crate regex; use regex::Regex; fn main() { let regex = Regex::new(r"Gesamtenergie.*\n.*\n*\s*\s(\d*)").unwrap(); let string = "<!DOCtype HTML PUBLIC \"-//W3C//Dtd HTML 4.0 Transitional//EN\"> <html> <head> <meta HTTP-EQUIV=\"Content-Type\" CONTENT=\"text/html; charset=ISO-8859-1\"> <meta name=\"Generator\" CONTENT=\"ChrisB\"> <title>PV Webserver</title> </head> <body nof=\"(MB=(DefaultMasterborder, 65, 60, 150, 10), L=(HomeLayout, 700, 600))\" bgcolor=\"#EAF7F7\" text=\"#000000\" link=\"#0033CC\" vlink=\"#990099\" alink=\"#FF0000\" topmargin=0 leftmargin=0 marginwidth=0 marginheight=0> <form method=\"post\" action=\"\"> <table cellspacing=\"0\" cellpadding=\"0\" width=\"770\" nof=\"ly\"> <tr><td height=\"5\"></td></tr> <tr><td width=\"190\" height=\"55\"></td> <td width=\"400\"> <font face=\"Arial,Helvetica,Geneva,Sans-serif,sans-serif\" size=\"+3\"> PIKO 5.5 <br><font size=\"+1\"> S_Power (220) </font> </font> </td> <td><img alt=\"Logo\" height=\"42\" width=\"130\" src=\"KSE.gif\"></td> </tr> </table> <font face=\"Arial,Helvetica,Geneva,Sans-serif,sans-serif\"> <table Border=\"0\" width=\"100%\"><tr> <td width=\"150\"></td> <td> <hr> </td> </tr></table> <table cellspacing=\"0\" cellpadding=\"0\" width=\"770\"> <tr><td></td></tr> <tr> <td width=\"190\"></td> <td colspan=\"2\"> <b>AC-Leistung</b></td> <td>&nbsp</td> <td> <b>Energie</b></td></tr> <tr><td height=\"10\"></td></tr> <tr> <td width=\"190\"></td> <td width=\"100\"> aktuell</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"140\">&nbsp W</td> <td width=\"100\"> Gesamtenergie</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> 33763</td> <td width=\"50\">&nbsp kWh</td> <td>&nbsp</td></tr> <tr height=\"2\"><td></td></tr> <tr> <td width=\"190\"></td> <td width=\"100\"> &nbsp</td> <td width=\"70\" align=\"right\"> &nbsp</td> <td width=\"140\">&nbsp</td> <td width=\"100\"> Tagesenergie</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> 22.85</td> <td width=\"50\">&nbsp kWh</td> <td>&nbsp</td></tr> <tr height=\"5\"><td></td></tr> <tr> <td width=\"190\"></td> <td width=\"100\"> Status</td> <td colspan=\"4\"> Aus</td> <td>&nbsp</td></tr> <tr height=\"8\"><td></td></tr> <tr><td colspan=\"7\"> <table align=\"top\" width=\"100%\"><tr> <td width=\"182\"></td> <td><hr size=\"1\"></font></td></tr> <tr><td height=\"5\"></td></tr></table> </td></tr> <tr> <td width=\"190\"></td> <td colspan=\"2\"> <b>PV-Generator</b></td> <td width=\"140\">&nbsp</td> <td colspan=\"2\"> <b>Ausgangsleistung</b></td> <td width=\"30\">&nbsp</td> <td>&nbsp</td></tr> <tr><td height=\"10\"></td></tr> <tr> <td width=\"190\"></td> <td width=\"100\"> <u>String 1</u></td> <td width=\"70\">&nbsp</td> <td width=\"140\">&nbsp</td> <td width=\"95\"> <u>L1</u></td> <td width=\"70\">&nbsp</td> <td width=\"30\">&nbsp</td> <td>&nbsp</td></tr> <tr> <td width=\"190\"></td> <td width=\"100\"> Spannung</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"140\">&nbsp V</td> <td width=\"100\"> Spannung</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"30\">&nbsp V</td> <td>&nbsp</td></tr> <tr height=\"2\"><td></td></tr> <tr valign=\"top\" align=\"left\"> <td width=\"190\">&nbsp</td> <td width=\"100\"> Strom</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"140\">&nbsp A</td> <td width=\"100\"> Leistung</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"30\">&nbsp W</td> <td>&nbsp</td></tr> <tr height=\"22\"><td></td></tr> <tr> <td width=\"190\"></td> <td width=\"100\"> <u>String 2</u></td> <td width=\"70\">&nbsp</td> <td width=\"140\">&nbsp</td> <td width=\"100\"> <u>L2</u></td> <td width=\"70\">&nbsp</td> <td width=\"30\">&nbsp</td> <td>&nbsp</td></tr> <tr> <td width=\"190\"></td> <td width=\"100\"> Spannung</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"140\">&nbsp V</td> <td width=\"100\"> Spannung</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"30\">&nbsp V</td> <td>&nbsp</td></tr> <tr height=\"2\"><td></td></tr> <tr valign=\"top\" align=\"left\"> <td width=\"190\">&nbsp</td> <td width=\"100\"> Strom</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"140\">&nbsp A</td> <td width=\"100\"> Leistung</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"30\">&nbsp W</td> <td>&nbsp</td></tr> <tr height=\"22\"><td></td></tr> <tr> <td width=\"190\"></td> <td width=\"100\"> <u>String 3</u></td> <td width=\"70\">&nbsp</td> <td width=\"140\">&nbsp</td> <td width=\"100\"> <u>L3</u></td> <td width=\"70\">&nbsp</td> <td width=\"30\">&nbsp</td> <td>&nbsp</td></tr> <tr> <td width=\"190\"></td> <td width=\"100\"> Spannung</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"140\">&nbsp V</td> <td width=\"95\"> Spannung</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"30\">&nbsp V</td> <td>&nbsp</td></tr> <tr height=\"2\"><td></td></tr> <tr valign=\"top\" align=\"left\"> <td width=\"190\">&nbsp</td> <td width=\"95\"> Strom</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"140\">&nbsp A</td> <td width=\"95\"> Leistung</td> <td width=\"70\" align=\"right\" bgcolor=\"#FFFFFF\"> x x x&nbsp</td> <td width=\"30\">&nbsp W</td> <td>&nbsp</td></tr> <tr><td height=\"15\"></td></tr> <tr><td colspan=\"7\"> <table align=\"top\" width=\"100%\"> <tr><td width=\"182\"></td> <td><hr size=\"1\"></font></td> </tr><tr><td height=\"5\"></td></tr></table> </td></tr></table> <table cellspacing=\"0\" cellpadding=\"0\" width=\"770\"> <tr><td width=\"190\"></td> <td><font face=\"Arial,Helvetica,Geneva,Sans-serif\"> <b>RS485 Kommunikation</b></td></tr> <tr><td height=\"8\"></td></tr> <tr><td width=\"190\"></td> <td><font face=\"Arial,Helvetica,Geneva,Sans-serif\"> Wechselrichter&nbsp <input type=\"Text\" name=\"edWrNr\" value=\"220\" size=\"3\" maxlength=\"3\"> <input type=\"submit\" value=\"Anzeigen/Aktualisieren\"> </td></tr><tr><td height=\"10\"></td></tr> </table> </td></tr></table></font> <hr> <table cellspacing=\"0\" cellpadding=\"0\" width=\"770\"> <tr><td height=\"5\"></td></tr> <tr><td width=\"190\"></td> <td width=\"330\"> <font face=\"Arial,Helvetica,Geneva,Sans-serif,sans-serif\"> <a href=\"LogDaten.dat\">Historie</a> &nbsp &nbsp &nbsp <a href=\"Info.fhtml\">Infoseite</a></font></td> <td align=\"right\"> <font face=\"Arial,Helvetica,Geneva,Sans-serif,sans-serif\"> <a href=\"Solar2.fhtml\">Einstellungen</a></font></td> <td width=\"50\"></td> </tr></table></font> </form> </body> </html> "; // result will be an iterator over tuples containing the start and end indices for each match in the string let result = regex.captures_iter(string); for mat in result { println!("{:?}", mat); } }

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 Rust, please visit: https://docs.rs/regex/latest/regex/