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Regular expression for the percentage of labels

I am trying to create a regex that matches a percentage for labels

For example, if we consider a few percent

1)100%
2)56.78%
3)56 78.90%
4)34.6789%

The corresponding percentages should be

100%
56.78%
34.6789%

I made an expression "\\d.+[\\d]%"

, but it also matches for 56 78.90%

which I don't want.

If anyone knows such an expression, share

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4 answers 


\\d+(?:\\.\\d+)?%

This should do it for you.

For stricter test use



\b(?<!\.)(?!0+(?:\.0+)?%)(?:\d|[1-9]\d|100)(?:(?<!100)\.\d+)?%

See demo.

https://regex101.com/r/zsNIrG/2

+9


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You don't have a double escaping dot, which means its wildcard for any character, including spaces.

Use something like:

 ┌ integer part - any 1+ number of digits
 |   ┌ dot and decimal part (grouped)
 |   |┌ double-escaped dot
 |   ||  ┌ decimal part = any 1+ number of digits
 |   ||  |    ┌ 0 or 1 greedy quantifier for whole group
 |   ||  |    |
"\\d+(\\.\\d+)?%"

For example:

String[] inputs = { "100%", "56.78%", "56 78.90%", "34.6789%" };
Matcher m = null;
for (String s: inputs) {
    m = p.matcher(s);
    if (m.find())
        System.out.printf("Found: %s%n", m.group());
}

Output

Found: 100%
Found: 56.78%
Found: 78.90%
Found: 34.6789%

Note



This still matches the 3rd input, but only the last part.

If you want the third input to not match, you can surround your pattern with input boundaries, for example ^

for the start of input and $

for the end of input.

This will become: "^\\d+(\\.\\d+)?%$"

Or you can just call Matcher#matches

instead Matcher#find

.

Next step

You might want to do something about the numeric value you are retrieving.

In this case, you can surround your template with a group ( "(\\d+(\\.\\d+)?)%"

) and call either Double.parseDouble

or new BigDecimal(...)

in your backlink:

  • Double.parseDouble(m.group(1))

  • new BigDecimal(m.group(1))

+4


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RegEx \\d+(\\.?\\d+)?%

will work.

0


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^ ((100) | (\ d {1,2} (\ d *)).)% $

Check out this regex here: https://regex101.com/r/Ou3mJI/2

You can use this regex. This is true for:

  • from 0 to 100 inclusive
  • With and without decimal places

The following are valid values:

100% valid
99.802% valid
98.7% valid
57% valid
0% -

This regex is not valid below values:

  • Negative numbers
  • Number> 100
  • Number with spaces

Invalid values:

-1%
99.989%
101%
56 78.90%

Hope this helps!

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