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ICU-21492 Fix regex compile assertion failure. #1577

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Feb 18, 2021
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ICU-21492 Fix regex compile assertion failure. #1577

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7 changes: 5 additions & 2 deletions icu4c/source/i18n/regexcmp.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3475,6 +3475,9 @@ int32_t RegexCompile::minMatchLength(int32_t start, int32_t end) {
// value may be longer than the actual maximum; it must
// never be shorter.
//
// start, end: the range of the pattern to check.
// end is inclusive.
//
//------------------------------------------------------------------------------
int32_t RegexCompile::maxMatchLength(int32_t start, int32_t end) {
if (U_FAILURE(*fStatus)) {
Expand Down Expand Up @@ -3720,14 +3723,14 @@ int32_t RegexCompile::maxMatchLength(int32_t start, int32_t end) {
// Look-behind. Scan forward until the matching look-around end,
// without processing the look-behind block.
int32_t dataLoc = URX_VAL(op);
for (loc = loc + 1; loc < end; ++loc) {
for (loc = loc + 1; loc <= end; ++loc) {
op = (int32_t)fRXPat->fCompiledPat->elementAti(loc);
int32_t opType = URX_TYPE(op);
if ((opType == URX_LA_END || opType == URX_LBN_END) && (URX_VAL(op) == dataLoc)) {
break;
}
}
U_ASSERT(loc < end);
U_ASSERT(loc <= end);
}
break;

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5 changes: 5 additions & 0 deletions icu4c/source/test/testdata/regextst.txt
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Expand Up @@ -1497,6 +1497,11 @@
#
"(?w)\b" v2 "äää<0></0> äää"

# Bug ICU-21492 Assertion failure with nested look-around expressions.
#
"(?<=(?:(?<=(?:(?<=(?:(?<=)){2})){3})){4}" E "<0></0>" # orig failure from bug report, w mismatched parens.
"(?:(?<=(?:(?<=)){2}))" "<0></0>" # Simplified case, with a valid pattern.

# Random debugging, Temporary
#

Expand Down