从.txt文件列表中删除第一个字符

Question

I have a list like this, stored in a .txt-file:

0   This is one Sentence
1   some more information
2   username 11
3   username 33
4   Maybe some Anime?
5   Another Anime?
6   Please no more Anime.

The list goes from 0 to 1250. What would be the best way to delete the first 1 to four digits and the space?

Any help appreciated. :)

Answer 1

Here's how I'd do it using a regex.

<?php
$string = '0   This is one Sentence
1   some more information
2   username 11
3   username 33
4   Maybe some Anime?
5   Another Anime?
6   Please no more Anime.';
echo preg_replace('~^\d+\s+~m', '', $string);

Output:

This is one Sentence
some more information
username 11
username 33
Maybe some Anime?
Another Anime?
Please no more Anime.

~ is a delimiter it tells the regex where the expression starts and ends. The ^ is the start of each line because of the m modifier. The \d+ is one or more numbers. The \s+ is one or more white space characters. The + is a quantifier meaning one or more of the preceding character, if you wanted 0 or more you would use *.