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^[+-]?((0\.\d+)|([1-9]+(\d?\.\d+)?))$

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^ asserts position at start of the string

Match a single character present in the list below

[+-]

? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

+ matches the character + with index 43_{10} (2B_{16} or 53_{8}) literally (case sensitive)

- matches the character - with index 45_{10} (2D_{16} or 55_{8}) literally (case sensitive)

This hyphen is treated literally, which might be confusing for others. Consider escaping it or placing at the start or end of the class!

1st Capturing Group

((0\.\d+)|([1-9]+(\d?\.\d+)?))

1st Alternative

(0\.\d+)

2nd Capturing Group

(0\.\d+)

0 matches the character 0 with index 48_{10} (30_{16} or 60_{8}) literally (case sensitive)

\. matches the character . with index 46_{10} (2E_{16} or 56_{8}) literally (case sensitive)

\d

matches a digit (equivalent to [0-9])+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

2nd Alternative

([1-9]+(\d?\.\d+)?)

3rd Capturing Group

([1-9]+(\d?\.\d+)?)

Match a single character present in the list below

[1-9]

+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

1-9 matches a single character in the range between 1 (index 49) and 9 (index 57) (case sensitive)

4th Capturing Group

(\d?\.\d+)?

? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

\d

matches a digit (equivalent to [0-9])? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

\. matches the character . with index 46_{10} (2E_{16} or 56_{8}) literally (case sensitive)

\d

matches a digit (equivalent to [0-9])+ matches the previous token between one and unlimited times, as many times as possible, giving back as needed (greedy)

$ asserts position at the end of the string

Your regular expression does not match the subject string.

No Match

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