Got it, let's tackle this regex problem step by step. Your goal is to capture the 4-digit and 6-digit parts of a Russian passport number that follows the keyword паспорт, regardless of whether the parts are separated by spaces, a hyphen, or a hyphen with spaces around it.

The Correct Regex #

Here's a regex that covers all your specified cases:

паспорт\s+(\d{4})\s*[-]?\s*(\d{6})

Breakdown of the Regex #

Let's break down each component to explain how it works:

• паспорт: Explicitly matches the keyword (add the /i modifier if you need case-insensitive matching for variations like Паспорт)
• \s+: Matches one or more spaces right after the keyword (covers the gap between "паспорт" and the first set of digits)
• (\d{4}): Captures the first group of 4 digits (this will be your first expected result)
• \s*[-]?\s*: Handles all possible separators:
  • \s*: Matches 0 or more spaces (covers spaces before/after the hyphen)
  • [-]?: Makes the hyphen optional (so it works with or without the hyphen)
• (\d{6}): Captures the second group of 6 digits (your second expected result)

Testing Against Your Examples #

Let's verify this regex against your sample inputs:

1. Input: паспорт 5715 424141 → Captured groups: 5715 (group 1), 424141 (group 2)
2. Input: паспорт 5715-424141 → Captured groups: 5715 (group 1), 424141 (group 2)
3. Input: паспорт 5715 - 424141 → Captured groups: 5715 (group 1), 424141 (group 2)

Why Your Original Regex Failed #

Your initial regex ^(\d{4})\ (\d{6})$ had two main issues:

• It uses ^ and $ which force a full-line match, so it won't work if the text includes the "паспорт" keyword before the digits.
• It only accounts for a single space as a separator, completely ignoring hyphens or hyphens with surrounding spaces.

内容的提问来源于stack exchange，提问作者Alex Nikitin