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^[+-]?(?!\.(?!\d)|$)\d*(?:\.\d*)?(?:(?<=[\d.])e[+-]?\d+)?$

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igm

^ asserts position at start of a line

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 a single character in the list +- (case insensitive)Negative Lookahead

(?!\.(?!\d)|$)

Assert that the Regex below does not match

1st Alternative

\.(?!\d)

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

Negative Lookahead

(?!\d)

Assert that the Regex below does not match

\d matches a digit (equivalent to [0-9])

2nd Alternative

$

$ asserts position at the end of a line

\d

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

Non-capturing group

(?:\.\d*)?

? 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 insensitive)

\d

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

Non-capturing group

(?:(?<=[\d.])e[+-]?\d+)?

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

Positive Lookbehind

(?<=[\d.])

Assert that the Regex below matches

Match a single character present in the list below

[\d.]

\d matches a digit (equivalent to [0-9])

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

e matches the character e with index 101_{10} (65_{16} or 145_{8}) literally (case insensitive)

Match a single character present in the list below

[+-]

+-

matches a single character in the list +- (case insensitive)\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 a line

Global pattern flags

i modifier: **i**nsensitive. Case insensitive match (ignores case of [a-zA-Z])

g modifier: **g**lobal. All matches (don't return after first match)

m modifier: **m**ulti line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)

Your regular expression does not match the subject string.Try launching the debugger to find out why.

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igm

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