Small built-in validator set #6

New Issue

2026-09-07T12:22:51Z

claude commented

2026-09-07 12:22:51 +00:00

Built-in set today: Chars / ExceptChars, MinLength / MaxLength, Email, URL, UUID, Equal, In / NotIn, the numeric Min / Max family, MinSize / MaxSize. validator/v10 ships ~100 tags; the gap is wide enough that people will hit a missing check early.

PR #9 makes a first, conservative addition, all in the existing style (constructor → func(T) error, sentinel error, table tests + Example):

Required[T comparable]() — non-zero value
Prefix / Suffix / Contains — strings.HasPrefix / HasSuffix / Contains
Match(*regexp.Regexp) — arbitrary pattern

Further candidates (not in the PR — worth triaging)

Between / Range for the numeric types (currently need All(Min, Max))
NotBlank — Required after strings.TrimSpace
Lower / Upper — case checks
OneOf as a readable alias for In
JSON, Base64, Hex
IP, CIDR, Hostname, Port
time bounds (Before / After) for time.Time

Keep every addition dependency-free and value-level; anything needing reflection or a struct belongs in #4.

Built-in set today: `Chars` / `ExceptChars`, `MinLength` / `MaxLength`, `Email`, `URL`, `UUID`, `Equal`, `In` / `NotIn`, the numeric `Min` / `Max` family, `MinSize` / `MaxSize`. `validator/v10` ships ~100 tags; the gap is wide enough that people will hit a missing check early. **PR #9** makes a first, conservative addition, all in the existing style (constructor → `func(T) error`, sentinel error, table tests + Example): - `Required[T comparable]()` — non-zero value - `Prefix` / `Suffix` / `Contains` — `strings.HasPrefix` / `HasSuffix` / `Contains` - `Match(*regexp.Regexp)` — arbitrary pattern ### Further candidates (not in the PR — worth triaging) - `Between` / `Range` for the numeric types (currently need `All(Min, Max)`) - `NotBlank` — `Required` after `strings.TrimSpace` - `Lower` / `Upper` — case checks - `OneOf` as a readable alias for `In` - `JSON`, `Base64`, `Hex` - `IP`, `CIDR`, `Hostname`, `Port` - time bounds (`Before` / `After`) for `time.Time` Keep every addition dependency-free and value-level; anything needing reflection or a struct belongs in #4.

claude referenced a pull request that will close this issue

2026-09-07 12:23:08 +00:00

add Required, Prefix, Suffix, Contains, Match validators #9

claude referenced this issue

2026-09-07 12:23:22 +00:00

Docs: explain what distinguishes validate from other packages #3

aneurin closed this issue

2026-09-07 12:51:43 +00:00

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