[regex] Regex Until But Not Including

For regex what is the syntax for search until but not including? Kinda like:

Haystack:
The quick red fox jumped over the lazy brown dog

Expression:
.*?quick -> and then everything until it hits the letter "z" but do not include z

A lookahead regex syntax can help you to achieve your goal. Thus a regex for your example is

.*?quick.*?(?=z)

And it's important to notice the .*? lazy matching before the (?=z) lookahead: the expression matches a substring until a first occurrence of the z letter.

Here is C# code sample:

const string text = "The quick red fox jumped over the lazy brown dogz";

string lazy = new Regex(".*?quick.*?(?=z)").Match(text).Value;
Console.WriteLine(lazy); // The quick red fox jumped over the la

string greedy = new Regex(".*?quick.*(?=z)").Match(text).Value;
Console.WriteLine(greedy); // The quick red fox jumped over the lazy brown dog

Try this

(.*?quick.*?)z