Build, test, and debug regular expressions
This regex matches variations of 'master informatique' (Computer Science Master's degree) commonly found in French resumes and job postings. It captures both the general form with up to 30 non-digit characters between 'master' and 'informatique', and the specific 'master 2' variant (M2, second year of Master's) with a tighter 3-character gap. The pattern is useful for parsing CVs, job applications, and educational credentials in recruitment systems.