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To map certain patterns to c# Regex, we can use the following syntax:

Regex regex = new Regex(pattern); 

where pattern is the regular expression pattern that we want to map.

For example, if we want to map the pattern of a string containing only letters and numbers, we can use the following code:

Regex regex = new Regex("^[a-zA-Z0-9]*$"); 

This regular expression pattern ^[a-zA-Z0-9]*$ matches any string that contains only letters and numbers.

We can also use various other regular expression patterns to match specific patterns, such as:

• ^[\d]*$ matches any string containing only digits
• ^[\w]*$ matches any string containing only word characters (letters, digits and underscore)
• ^((?!pattern).)*$ matches any string that does not contain a specific pattern
• ^[a-zA-Z]*(?=\d).* matches any string that starts with letters and ends with digits

By using regular expressions, we can effectively map specific patterns to c# Regex and use them to find or replace strings that match those patterns.