Regular Expression To Check If Number Is Float

A Regular Expression to check if the number you provide is a float value.

/^[-+]?[0-9]+[.]?[0-9]*([eE][-+]?[0-9]+)?$/

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Matches:

• 12345
• -123.45
• 123.45e-5

Non-matches:

• abcd
• 123.45e
• 12.34.56

See Also:

• Negative Number Regular Expression
• Positive Integer Regular Expression

Expression Flags

Flags	Description
i	Ignore case sensitive.
g	Allows global search.
m	Allows multiline search.