RE2TestW32

#include <re2/re2.h>
#include <cstdio>

void CHECK(bool n) {
    printf("%s\n",n?"true":"false");
}

int main() {
    CHECK(RE2::PartialMatch("123","^[0-9]+"));
    CHECK(RE2::PartialMatch("abc123","^[0-9]+"));
    CHECK(RE2::PartialMatch("123abx","^[0-9]+"));
    CHECK(RE2::PartialMatch("12x3","^[0-9]+"));
    CHECK(RE2::PartialMatch("12x3","^[0-9]{3,4}"));
    CHECK(RE2::PartialMatch("125x3","^[0-9]{3,4}"));
    return 0;
}


OUTPUT:
true
false
true
true
false
true