如何将字符串中的数字字符转换成数字

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比如字符串中有22个字节的数据“1234567899876543211234“，怎样从中提取出这22个数字

[ian_fung · Accepted solution]

This is what I have... using for-loop and string to numeric conversion function...

PS: could be better solutions out there though 😉