December 2009
Intermediate to advanced
560 pages
15h 5m
German
Content preview from Reguläre Ausdrücke KochbuchBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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3.17 Alle Übereinstimmungen innerhalb der Übereinstimmungen einer anderen Regex ersetzen
Problem
Sie wollen alle Übereinstimmungen eines bestimmten regulären Ausdrucks ersetzen, aber nur in bestimmten Bereichen des Ausgangstexts. Ein weiterer regulärer Ausdruck findet jeden dieser Bereiche im String.
Stellen Sie sich beispielsweise vor, Sie haben eine HTML-Datei, in der eine Reihe von Abschnitten mit <b>-Tags als fett markiert ist. Zwischen jedem Paar Bold-Tags wollen Sie alle Übereinstimmungen des regulären Ausdrucks ‹vorher› durch den Ersetzungstext ‹danach› austauschen. Wenn Sie zum Beispiel den String vorher <b>erster vorher</b> vorher <b>vorher vorher</b> bearbeiten, erwarten Sie als Ergebnis vorher <b>erster danach</b> vorher <b>danach danach</b> ...
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