🔧 Using Zero-Width Assertions in Regular Expressions

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📆 Veröffentlicht am: 08.07.2024 um 20:00 Uhr
Nachrichtenbereich: 🔧 Programmierung
🔗 Quelle: dzone.com

Anchors ^ $ \b \A \Z

Anchors in regular expressions allow you to specify the context in a string where your pattern should be matched. There are several types of anchors:

• ^ matches the start of a line (in multiline mode) or the start of the string (by default).
• $ matches the end of a line (in multiline mode) or the end of the string (by default).
• \A matches the start of the string.
• \Z or \z matches the end of the string.
• \b matches a word boundary (before the first letter of a word or after the last letter of a word).
• \B matches a position that is not a word boundary (between two letters or between two non-letter characters).

These anchors are supported in Java, PHP, Python, Ruby, C#, and Go. In JavaScript, \A and \Z are not supported, but you can use ^ and $ instead of them; just remember to keep the multiline mode disabled. 

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