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callcount

regexp.Regexp.Split

standard library

The 4028th most-called standard-library method by production calls. Called 181 times across 93 modules; 152 of those run outside tests and generated code.

1% in production calls vs 2026-W39 (151 → 152)

All of regexp → Docs on pkg.go.dev ↗

prod calls
152
non-test, non-generated
all calls
181
total callsites
modules
93
distinct callers
in loop
24%
of prod calls
in tests
16%
29 calls
resolved
100%
to a known target

resolution mix

How each call resolves

How each call was attributed. Only resolved kinds, where the target function is known, count toward the ranking. Interface dispatch and unresolved receivers are reported separately and never guessed. Read the taxonomy →

  • Concrete method100%A method on a value whose type is known exactly.

estimate

Experimental

Estimated relative cost

Roughly 0.01× the estimated relative cost of fmt.Sprintf . Benchmarked at 1034 ns/op × 152 production calls, normalized so fmt.Sprintf = 1.0.

This is not dollars and not a verdict. Per-op time depends heavily on inputs (argument sizes, contention, patterns), the benchmark ran on a single machine (darwin/arm64 (Apple Silicon), go1.26.0), and static call counts are not runtime frequency. How this is estimated →

who calls this

Notable callers

Production calls into Regexp.Split from notable Go projects. Open one on the map to see what else it hammers.

where it's called

Callsites in the wild

12 representative callsites of 181, prioritizing in-loop and non-test usage. We link to source, never display it.

Regexp.Split · 12 of 181 callsites

top callers

The modules that reach for it

The modules that call Regexp.Split most in this snapshot.

  • github.com/infiniflow/ragflow116%
  • github.com/pkg/sftp84%
  • github.com/microsoft/typescript-go74%
  • github.com/Tencent/WeKnora53%
  • github.com/googleapis/mcp-toolbox53%

siblings

More from regexp

The other most-called members in this package. See all →