bundles/org.eclipse.platform.doc.user/reference/ref-regex-find-replace.htm

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="en">
  <head>
    <meta name="copyright" content=
    "Copyright (c) IBM Corporation and others 2008, 2012. This page is made available under license. For full details see the LEGAL in the documentation book that contains this page." />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta http-equiv="Content-Style-Type" content="text/css" />
    <title>
      Supported Regular Expressions
    </title>
    <link rel="STYLESHEET" href="../book.css" charset="ISO-8859-1" type=
    "text/css" />
  </head>
  <body>
    <h1 class="Head">
      Supported Regular Expressions
    </h1>
    <p>
      When searching for text you can use the regular expressions as defined by
      the <a href=
      "https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/regex/Pattern.html">Pattern
      class</a>.<br />
      Additionally, \R can be used to match any form of line delimiter (Unix,
      Windows, Classic Mac OS). Note that \R does not work in character groups ([]).
    </p>

    <p>
      The replace string allows the following constructs:
    </p>
    <table border="1" cellpadding="5" summary=
    "supported constructs in the replace field">
      <tbody>
        <tr>
          <td>
            $i
          </td>
          <td>

            inserts <a href=
            "https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/regex/Pattern.html#cg">
            capturing group</a> i.
          </td>
        </tr>
        <tr>
          <td>
            \i
          </td>

          <td>
            inserts <a href=
            "https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/regex/Pattern.html#cg">
            capturing group</a> i (same as $i).
          </td>
        </tr>
        <tr>
          <td>
            \<i>x</i>

          </td>
          <td>
            quotes character <i>x</i> (unless \<i>x</i> has a special meaning)
          </td>
        </tr>
        <tr>

          <td>
            \R
          </td>
          <td>
            inserts the default line delimiter of the document
          </td>
        </tr>
        <tr>
          <td>
            \x<i>hh</i>

          </td>
          <td>
            inserts the hexadecimal character <i>hh</i>
          </td>
        </tr>
        <tr>
          <td>
            \u<i>hhhh</i>

          </td>
          <td>
            inserts the Unicode character <i>hhhh</i>
          </td>
        </tr>
        <tr>
          <td>
            \n
          </td>

          <td>
            inserts a newline character (usually, you should use \R instead)
          </td>
        </tr>
        <tr>
          <td>
            \r
          </td>
          <td>
            inserts a carriage-return character (usually, you should use \R
            instead)
          </td>

        </tr>
        <tr>
          <td>
            \t
          </td>
          <td>
            inserts a tab character
          </td>
        </tr>
        <tr>

          <td>
            \f
          </td>
          <td>
            inserts a form-feed character
          </td>
        </tr>
        <tr>
          <td>
            \a
          </td>

          <td>
            inserts an alert (beep) character
          </td>
        </tr>
        <tr>
          <td>
            \e
          </td>
          <td>
            inserts an escape character
          </td>

        </tr>
        <tr>
          <td>
            \c<i>X</i>
          </td>
          <td>
            inserts the control character for <i>X</i>

          </td>
        </tr>
        <tr>
          <td>
            \C
          </td>
          <td>
            retains the casing of the match (all lower case, all upper case,
            capitalized) for the rest of the replace string
          </td>
        </tr>

      </tbody>
    </table>
  </body>
</html>