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diff -Naur csvutils-0.9.3+20161218_e57951b/src/csvgrep.c csvutils-0.9.3+20161218_e57951b.patched/src/csvgrep.c
--- csvutils-0.9.3+20161218_e57951b/src/csvgrep.c 2022-01-26 02:05:12.660602834 -0500
+++ csvutils-0.9.3+20161218_e57951b.patched/src/csvgrep.c 2022-01-26 02:22:34.393508136 -0500
@@ -788,7 +788,7 @@
#ifdef WITHOUT_PCRE
err("not compiled with pcre support");
#else
- re = pcre_compile(pattern, 0, &err_ptr, &rv, NULL);
+ re = pcre_compile(pattern, (ignore_case ? PCRE_CASELESS : 0), &err_ptr, &rv, NULL);
if (rv) {
fprintf(stderr, "Error parsing pattern expression: %s\n", err_ptr);
exit(EXIT_FAILURE);
@@ -798,7 +798,7 @@
#ifdef WITHOUT_POSIX
err("not compiled with posix support");
#else
- if ((rv = regcomp(&preg, pattern, REG_EXTENDED | REG_NOSUB )) != 0) {
+ if ((rv = regcomp(&preg, pattern, REG_EXTENDED | REG_NOSUB | (ignore_case ? REG_ICASE : 0))) != 0) {
regerror(rv, &preg, errbuf, sizeof errbuf);
fprintf(stderr, "Error parsing pattern expression: %s\n", errbuf);
exit(EXIT_FAILURE);
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