[linear-code]

In local evaluation, Matches regex segment conditions matched anywhere in the trait value, so prod matched nonproduction. Other SDKs and the Flagsmith documentation say the match must start at the beginning of the value, without having to cover the whole value.

Changes

• Regex conditions only match from the start of the trait value, e.g. prod matches production but not nonproduction.
• The start constraint applies to every alternative, e.g. prod|dev doesn't match nondevelopment.
• Regex conditions still don't have to match the full value.

Closes https://linear.app/flagsmith/issue/SDK-30/standardise-regex-matching-in-the-elixir-server-side-sdk

Review effort: 1/5

[linear-code]

SDK-30

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[linear-code]

@coderabbitai review

[codspeed]

Merging this PR will not alter performance

✅ 12 untouched benchmarks

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_{Comparing linear/sdk-30-standardise-regex-matching-in-the-elixir-server-side-e7ff (906bfec) with main (edb95fb)}