Grep: invalid repetition count

regex bash shell curl grep

grep -e does not recognize \d as digits. It does not recognize non-greedy forms like .*?. For the grep portion of your command, try:

grep -e '"weather":[^[]*\[[^{]*{[^}]*"id": *[0-9]\{1,3\}'

Alternatively, it your grep supports it (GNU), use the -P option for perl-like regex and your original regex will work:

grep -P '"weather":.*?\[.*?\{.*?"id": ?\d{1,3}'

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