我需要在 C 中替换字符串。在此处的答案之一中推荐了如何在纯 C 中进行正则表达式字符串替换?使用 PCRS 库。我从这里ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/Contrib/下载了 PCRS,但我对如何使用它感到困惑。下面是我的代码(取自另一个 SE 帖子)
const char *error;
int erroffset;
pcre *re;
int rc;
int i;
int ovector[100];
char *regex = "From:([^@]+).*";
char str[] = "From:regular.expressions@example.com\r\n";
char stringToBeSubstituted[] = "gmail.com";
re = pcre_compile (regex, /* the pattern */
PCRE_MULTILINE,
&error, /* for error message */
&erroffset, /* for error offset */
0); /* use default character tables */
if (!re)
{
printf("pcre_compile failed (offset: %d), %s\n", erroffset, error);
return -1;
}
unsigned int offset = 0;
unsigned int len = strlen(str);
while (offset < len && (rc = pcre_exec(re, 0, str, len, offset, 0, ovector, sizeof(ovector))) >= 0)
{
for(int i = 0; i < rc; ++i)
{
printf("%2d: %.*s\n", i, ovector[2*i+1] - ovector[2*i], str + ovector[2*i]);
}
offset = ovector[1];
}
与“pcre_compile”和“pcre_exec”相反,我需要从 PCRS 使用哪些功能?
谢谢。