Just how much does the RegexOptions.Compiled flag improve regular expression performance in .NET? The answer: a lot! People have spoken about this before, but below are some more numbers to how you just how much it matters!
Performance Stats
| Character Count | Regex Pattern |
|---|---|
| 1 |
[a-z]
|
| 3 |
[b-y].[1-8]
|
| 5 |
[b-y].[c-x].[1-8].[2-7]
|
| 7 |
[b-y].[c-x].[d-w].[1-8].[2-7].[3-6]
|
| 9 |
[b-y].[c-x].[d-w].[e-v].[1-8].[2-7].[3-6].[4-5]
|
| RegexOptions | 1 | 3 | 5 | 7 | 9 |
|---|---|---|---|---|---|
| None | 234176 | 285067 | 653016 | 690282 | 687343 |
| Compiled | 193945 | 235213 | 430609 | 452483 | 454625 |
| Percent Gain | 17% | 17% | 34% | 34% | 34% |
