Regular expression to allow decimal or text

Please suggest me regular expression to allow all decimal number or text such as "na" OR "NA"
like
4.4 correct
0.5 correct
6 correct
te WRONG
na correct
NA correct
Swaragh 013Asked:
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ozoCommented:
na|NA|\d+(\.\d*)?
6
Terry WoodsIT GuruCommented:
Please note that @ozo's pattern will still match a substring of the string you're testing, so that values like te4.4 or tena will match. Depending on the circumstances, this may or may not matter.

If you're validating a form field, it probably does matter, in which case you'll probably want something like:
^(na|NA|\d+(\.\d*)?)$

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1
Swaragh 013Author Commented:
((^na$)|(^NA$))|(^[0-9]*.?[0-9]{1,9}$)
0

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Regular Expressions

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