How to find a regex pattern after a specific number of characters?

@gilbert 

To find a regex pattern after a specific number of characters, you can use the positive lookbehind assertion in regex. Here is an example of how you can do this in Python:

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import re

text = "This is a sample text with pattern after 5 characters:pattern"

pattern = re.compile(r'(?<=.{5})pattern')

matches = pattern.findall(text)

for match in matches:
    print(match)

In this example, the regex pattern (?<=.{5})pattern will find the word "pattern" that occurs after 5 characters in the string. The .{5} matches any 5 characters, and the positive lookbehind (?<=) asserts that the pattern "pattern" should come after these 5 characters.