raw, and they are sloppy about it: there may be extra spaces, unit suffixes and other junk. Pull an integer off the front of the string using these rules:
1. Skip every space ' ' at the start of the string.
2. If the next character is '-' or '+', read it as the sign. With no sign, the number is positive. At most one sign is allowed.
3. Read consecutive digits until a non-digit shows up or the string ends. Leading zeros don't change the value. If no digits were read at all, the result is 0.
4. The result has to fit a 32-bit signed integer: if it is below −2³¹, return −2³¹; if it is above 2³¹ − 1, return 2³¹ − 1.
Anything after the digits is ignored. Return the number you read.raw=' +0075 kg' → 75
Leading spaces are skipped, the "+" is read, then the digits "0075" give 75; reading stops at the space.
raw='-99999999999 m' → -2147483648
The number is below −2³¹, so the answer is pinned to the lower bound −2147483648.
raw='v2.5' → 0
The first meaningful character is the letter "v", neither a digit nor a sign, so no number is read and the answer is 0.
raw consists of English letters (lowercase and uppercase), digits, spaces and the characters +, -, .raw=' +0075 kg'
75
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