为什么声明匹配文本的第一个字符的位置是从0开始，而文本字符串却是从一开始，不是自相矛盾吗？

Question

var reg4=/\d(\w)(\w)\d/g;
var ts ='$1az2bbc3y4dd5ee';

 var ret=reg4.exec(ts)

Answer 1

Why is it stated that the position of the first character of matching text starts from 0, while the position of the text string starts from one? Isn’t it contradictory? -PHP Chinese website Q&A-Why is it stated that the position of the first character of matching text starts from 0, but the text string starts from the beginning? Isn't it contradictory? -PHP Chinese website Q&A

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Answer 2

位置0是在第一个字符的前面，0之前没有字符，位置1前面的就是第一个字符