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Sander Rossel wrote:

Also not sure about the nature of your project, but when an employee of mine would use regex, that no one knows or expects in a web API scenario, in favor of JSON, which everyone knows and expects in that scenario, I'd have a very serious talk with him

RAM:   [==        ]  20.6% (used 67656 bytes from 327680 bytes)
Flash: [=======   ]  65.1% (used 852905 bytes from 1310720 bytes)

Sander Rossel wrote:

I'm also not sure why JSON would be a dependency while regex is not

// \"unixtime\"[\t \r\n]*:[\t \r\n]*
int16_t wtime_unix_time_dfa_table[] PROGMEM = {
        -1, 1, 6, 1, 34, 34, -1, 1, 12, 1, 117, 117, -1, 1, 18,
        1, 110, 110, -1, 1, 24, 1, 105, 105, -1, 1, 30, 1, 120, 120,
        -1, 1, 36, 1, 116, 116, -1, 1, 42, 1, 105, 105, -1, 1, 48,
        1, 109, 109, -1, 1, 54, 1, 101, 101, -1, 1, 60, 1, 34, 34,
        -1, 2, 60, 3, 9, 10, 13, 13, 32, 32, 74, 1, 58, 58, 0,
        1, 74, 3, 9, 10, 13, 13, 32, 32
};

// runs a dfa state machine match algorithm
bool wtime_fa_match(const int16_t* dfa, int16_t(read_cb)(void*), void* cb_state = nullptr) {
    int tlen;
    int tto;
    int prlen;
    int pmin;
    int pmax;
    int i;
    int j;
    int ch;
    int state = 0;
    bool done;
    bool found = false;
    int acc = -1;
    ch = read_cb(cb_state);
    while (ch != -1) {
        acc = -1;
        done = false;
        while (!done) {
        start_dfa:
            done = true;
            acc = (int16_t)pgm_read_word(dfa+(state++));
            tlen = (int16_t)pgm_read_word(dfa+(state++));
            for (i = 0; i < tlen; ++i) {
                tto = (int16_t)pgm_read_word(dfa+(state++));
                prlen = (int16_t)pgm_read_word(dfa+(state++));
                for (j = 0; j < prlen; ++j) {
                    pmin = (int16_t)pgm_read_word(dfa+(state++));
                    pmax = (int16_t)pgm_read_word(dfa+(state++));
                    if (ch < pmin) break;
                    if (ch <= pmax) {
                        found = true;
                        ch = read_cb(cb_state);
                        state = tto;
                        done = false;
                        goto start_dfa;
                    }
                }
            }
        }
        if (acc != -1) {
            return found;
        }
        ch = read_cb(cb_state);
        state = 0;
    }
    return false;
}

honey the codewitch wrote:

Because I am not using a regex engine.

honey the codewitch wrote:

some simple code

Search for the json-key including quotes 
Search for ":" is an optional bonus, not strictly needed
Extract the string between the subsequent pair of double-quotes.
Wrap in a function

honey the codewitch wrote:

3 languages
Regex
C++
C#
To "parse" a fourth, a JSON subset

This brings to mind the children's song about the old lady who swallowed a fly.

The two last verses are:

I know an old lady
Who swallowed a cow.
I don't know how
She swallowed a cow
She swallowed the cow to catch the dog
What a hog to swallow a dog!
She swallowed the dog to catch the cat
Fancy that! To swallow a cat!
She swallowed the cat to catch the bird
How absurd, to swallowed a bird!
She swallowed the bird to catch the spider
That wriggled and tickled inside her.
She swallowed the spider to catch the fly.
I don't know why she swallowed a fly.
Perhaps she'll die...

I know an old lady who swallowed a horse!
She's dead, of course