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Editorial Team
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Asked: 2026-06-10T12:12:41+00:00

I want to capture the following pattern using Regex in C# and replace it

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I want to capture the following pattern using Regex in C# and replace it with word ‘Merged’

Characters should have at least four spaces or one tab. However they can be mixed

space space space – Invalid – ‘Not merged’

space space space space – Valid – ‘Merged’

space space space space space – Valid – ‘Merged’

space <tab> – Valid – ‘Merged’

<tab><tab> – Valid – ‘Merged’

space<tab><tab>space – Valid – ‘Merged’

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1 Answer

  1. Editorial Team

    The following should work:

    [ ]*\t[ \t]*|[ ]{4,}

    I represented spaces as [ ] to make it clear what is going on, but it will work just as well if you remove the square brackets.

    Explanation:

      [ ]*      # any number of spaces
  \t        # a single tab
  [ \t]*    # any number of spaces or tabs
|         # OR
  [ ]{4,}   # 4 or more spaces

    Example: http://www.rubular.com/r/MJYp80iEN1

    Here is an alternative that uses a lookahead to check the conditions, then just matches any number of spaces or tabs:

    (?=[ ]*\t|[ ]{4})[ \t]+
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