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regexp: Regexp shouldn't keep references to inputs

If you try to find something in a slice of bytes using a Regexp object,
the byte array will not be released by GC until you use the Regexp object
on another slice of bytes. It happens because the Regexp object keep
references to the input data in its cache.

Change-Id: I873107f15c1900aa53ccae5d29dbc885b9562808
Reviewed-by: Brad Fitzpatrick <>
Run-TryBot: Brad Fitzpatrick <>
TryBot-Result: Gobot Gobot <>
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dmage authored and bradfitz committed Feb 23, 2018
1 parent 37a038a commit 7263540146c75de8037501b3d6fb64f59a0d1956
Showing with 5 additions and 0 deletions.
  1. +5 −0 src/regexp/regexp.go
@@ -226,6 +226,11 @@ func (re *Regexp) get() *machine {
// grow to the maximum number of simultaneous matches
// run using re. (The cache empties when re gets garbage collected.)
func (re *Regexp) put(z *machine) {
// Remove references to input data that we no longer need.
z.inputBytes.str = nil
z.inputString.str = ""
z.inputReader.r = nil
re.machine = append(re.machine, z)

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