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Floating Point Number
[-+]
?
(
[0-9]
*
\.
)
?
[0-9]
+
Match a single character out of the list: one of the characters "-+"
Between zero and one times, as many times as possible, giving back as needed (greedy)
Match the regular expression below and capture its match into backreference number 1
Between zero and one times, as many times as possible, giving back as needed (greedy)
Match a single character out of the list: in the range between 0 and 9
Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
Match the character "." literally
Match a single character out of the list: in the range between 0 and 9
Between one and unlimited times, as many times as possible, giving back as needed (greedy)
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