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Fix for 31456 -- replace with optional matching group fails when there is no match #31493

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Fix for 31456 -- replace with optional matching group fails when there is no match #31493

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8dd871a
Update regex.jl
tlienart Mar 27, 2019
e6abbda
Adding tests for replace (issue 31456)
tlienart Mar 28, 2019
8012cb9
removing trailing whitespace in comment
tlienart Mar 28, 2019
cd82403
removing trailing whitespace in test
tlienart Mar 28, 2019
254805e
Update pcre.jl
tlienart Apr 2, 2019
f416fd1
Update regex.jl
tlienart Apr 2, 2019
aed992e
Update util.jl
tlienart Apr 2, 2019
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6 changes: 5 additions & 1 deletion base/pcre.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -155,7 +155,11 @@ function substring_length_bynumber(match_data, number)
s = RefValue{Csize_t}()
rc = ccall((:pcre2_substring_length_bynumber_8, PCRE_LIB), Cint,
(Ptr{Cvoid}, UInt32, Ref{Csize_t}), match_data, number, s)
rc < 0 && error("PCRE error: $(err_message(rc))")
if rc < 0
# PCRE2_ERROR_UNSET see https://code.woboq.org/qt5/qtbase/src/3rdparty/pcre2/src/pcre2_substring.c.html
rc == -55 && return 0
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# PCRE2_ERROR_UNSET see https://code.woboq.org/qt5/qtbase/src/3rdparty/pcre2/src/pcre2_substring.c.html
rc == -55 && return 0
rc == ERROR_UNSET && return 0

error("PCRE error: $(err_message(rc))")
end
convert(Int, s[])
end

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3 changes: 3 additions & 0 deletions base/regex.jl
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Expand Up @@ -364,6 +364,9 @@ replace_err(repl) = error("Bad replacement string: $repl")

function _write_capture(io, re, group)
len = PCRE.substring_length_bynumber(re.match_data, group)
# in the case of an optional group that doesn't match, len == 0
# e.g. replace("The fox.", r"fox(es)?" => s"bus\1")
len == 0 && return
ensureroom(io, len+1)
PCRE.substring_copy_bynumber(re.match_data, group,
pointer(io.data, io.ptr), len+1)
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5 changes: 5 additions & 0 deletions test/strings/util.jl
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Expand Up @@ -272,6 +272,11 @@ end
# Issue 13332
@test replace("abc", 'b' => 2.1) == "a2.1c"

# Issue 31456
@test replace("The fox.", r"fox(es)?" => s"bus\1") == "The bus."
@test replace("The foxes.", r"fox(es)?" => s"bus\1") == "The buses."
@test replace("The quick fox quickly.", r"(quick)?\sfox(es)?\s(run)?" => s"\1 bus\2 \3") == "The quick bus quickly."

# test replace with a count for String and GenericString
# check that replace is a no-op if count==0
for s in ["aaa", Test.GenericString("aaa")]
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