Feature: Non-Backtracking Expressions
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A Non-Backtracking Expression is matched independent of neighboring patterns, and will not backtrack in the event of a failed match. This is often used to improve performance.
Syntax
NOTE: The following syntax is an example based on some of the supported engines. For specific engine support, see Engines.
(?>…)— Matches the provided pattern, but no backtracking is performed if the match fails.
Engines
| Engine | Supported |
|---|---|
| Perl | ✔ |
| PCRE | ✔ |
| Boost.Regex | ✔ |
| .NET | ✔ |
| Oniguruma | ✔ |
| Hyperscan | ❌ |
| ICU | ✔ |
| Glib/GRegex | ✔ |
| ECMAScript | ❌ |