返回多个匹配但仅使用PHP和RegEX直到第一次出现模式

Question

I am having a dataset that looks like

I(0,123...789){
A(0,567...999){.......n=Marc.....}
B(2,655...265){..................}
C(3,993...333){..................}
M(8,635...254){.................;}
}
O(0,345...789){
A(0,567...999){.......n=Marc.....}
B(2,876...775){..................}
C(3,993...549){..................}
M(8,354...987){.................;}
}
I(0,987...764){
A(0,567...999){.......n=Marc.....}
B(2,543...265){..................}
C(7,998...933){..................}
M(8,645...284){.................;}
}
B(0,123...789){
.......
}
I(0,987...764){
A(0,567...999){.......n=John.....}
B(2,543...265){..................}
C(7,998...933){..................}
M(8,645...284){.................;}
}

I am trying to return all I "sections" so starting from "I" until the closing tag that comes after the ;} but only if the "I" section contains n=Marc.

So far I came with

^([I]\(.*\){.*n=Marc.*^[M]\(.*;}.)}

https://regex101.com/r/VSuZh5/1

However in some cases, when data has a pattern like

I(0,123...789){
A(0,567...999){.......n=Marc.....}
B(2,655...265){..................}
C(3,993...333){..................}
M(8,635...254){.................;}
}
O(0,345...789){
A(0,567...999){.......n=Marc.....}
B(2,876...775){..................}
C(3,993...549){..................}
M(8,354...987){.................;}
}

The regular expression returns both the I and O section. Is there a way to make sure it always return the I section?

• apologies for the dataset, it's huge and contains a lot of sensitive data which I can't make public.*

Answer 1

My guess is that we want an expression to return the O section that has n=Marc in it, something similar to:

(?=O\()([\s\S]*?n=Marc[\s\S]*?;}\s*})

Or maybe:

(?=O\()([\s\S]*?n=Marc[\s\S]*?;})\s*}

Demo 1

For I sections we'd simply change O to I:

(?=I\()([\s\S]*?n=Marc[\s\S]*?;})\s*}

Demo 2

Test

$re = '/(?=I\()([\s\S]*?n=Marc[\s\S]*?;})\s*}/m';
$str = 'I(0,123...789){
A(0,567...999){.......n=Marc.....}
B(2,655...265){..................}
C(3,993...333){..................}
M(8,635...254){.................;}
}
O(0,345...789){
A(0,567...999){.......n=Marc.....}
B(2,876...775){..................}
C(3,993...549){..................}
M(8,354...987){.................;}
}
I(0,987...764){
A(0,567...999){.......n=Marc.....}
B(2,543...265){..................}
C(7,998...933){..................}
M(8,645...284){.................;}
}
B(0,123...789){
.......
}
I(0,987...764){
A(0,567...999){.......n=John.....}
B(2,543...265){..................}
C(7,998...933){..................}
M(8,645...284){.................;}
}';

preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);

foreach ($matches as $key => $I) {
    echo $I[0] . "
";
}

Output

I(0,123...789){
A(0,567...999){.......n=Marc.....}
B(2,655...265){..................}
C(3,993...333){..................}
M(8,635...254){.................;}
}
I(0,987...764){
A(0,567...999){.......n=Marc.....}
B(2,543...265){..................}
C(7,998...933){..................}
M(8,645...284){.................;}
}