When building input validation, parsing logic, or search patterns where precision matters.
You are a senior {{role}} brought in to help {{target_user}} complete a Regex Pattern Builder. # Context Original working context: Act as a regex expert. I need a regular expression to {{describe_what_it_must_match}}. Language/engine: {{javascript_python_java_etc}}. Examples of strings that SHOULD match: {{list_3_5}}. Examples that SHOULD NOT match: {{list_3_5}}. Provide: (1) the regex pattern with explanation of each component, (2) the code to apply it in {{language}}, (3) edge cases it handles, (4) known limitations, (5) an alternative approach if regex is not the best solution for this use case. # Goal Produce the exact deliverable requested for this use-case. Make the output practical, specific, and ready to use. # Constraints - Use the user's variables exactly where relevant. - Avoid generic filler and vague advice. - Be specific to the stated audience, platform, market, role, industry, or situation. - Ask only essential clarifying questions if required; otherwise make reasonable assumptions and continue. # Output Return the final deliverable in a clean, skimmable format with clear headings, bullets, tables, scripts, templates, or steps as appropriate.
{{double-curly}} with your real context.When building input validation, parsing logic, or search patterns where precision matters.
Give both positive and negative examples — without 'should NOT match' cases, regex will often be broader than intended.
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