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Asked: 2026-06-06T20:51:46+00:00

I always get a headache when i try to figure out regex. I have

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I always get a headache when i try to figure out regex.

I have the following string examples:

3;#i_0_.f_membership_john.smith@domain.com_LThumb.jpg

2;#i_0_.f_membership_jane.doe@domain.com_LThumb.jpg

I need to get the john.smith@domain.com piece from the string. The end of the string will always be _LThumb.xxx and the prefix should be always xxx_membership_.

If someone can come up with some C# regex to help me with this i would be very grateful

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1 Answer

  1. Editorial Team

    \w+?_membership_(\S*?)_LThumb.jpg

    \w            # Capture a word character
 +            # One or more times
 ?            # Lazily (smallest match possible)
_membership_  # Literal string
(             # Start capturing group
\S            # Any character that isn't whitespace
 *            # Zero or more times
 ?            # Lazily (smallest match possible)
)             # End capturing group
_LThumb.jpg   # Literal string

    That includes the “should be there” prefix of membership at the front to make sure we pull only what we need out of our string.

    The e-mail will be in group 1 of the match.

    You can play with the regex at Regexr.

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