Regex to truncate trailing zeroes

Question

I\'m trying to construct a single regex (for Java) to truncate trailing zeros past the decimal point. e.g.

• 50.000 → 50
• 50.500 → 50.5
• 50.0500 → 5

Answer 1

For a general regex which should do the trick:

^\d+?0*\.??\d*?(?=0*?[^\d]*$)

You can replace the caret and dollar sign with whatever your boundaries should be. Those could be replaced by whatever you would expect around your number.

basically:

/d+? non-greedy match for any number (needs at least 1 number to start the match)

\.*?? optional match for a decimal. Prefers to match 0 occurrences

\d*? (?=0*?[^\d]*$) - non-greedy match for a number, but would stop at the 0 which is proceeded by a non-number

EDIT: I just realized the original expression also trimmed the last zero on integers, this should work. I added the option 0 match to catch that