Feature: Alternatives
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An Alternative represents two or more branches in a pattern. If first branch of a pattern fails to match, each alternative is attempted from left to right until a match is found.
Syntax
NOTE: The following syntax is an example based on some of the supported engines. For specific engine support, see Engines.
…|…— Matches the pattern to the left of the|. If that fails, matches the pattern to the right of|.
Engines
| Engine | Supported |
|---|---|
| Perl | ✔ |
| PCRE | ✔ |
| Boost.Regex | ✔ |
| .NET | ✔ |
| Oniguruma | ✔ |
| Hyperscan | ✔ |
| ICU | ✔ |
| Glib/GRegex | ✔ |
| ECMAScript | ✔ |