Regular expression to allow decimal or text

Please suggest me regular expression to allow all decimal number or text such as "na" OR "NA"
4.4 correct
0.5 correct
6 correct
na correct
NA correct
Swaragh 013Asked:
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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:

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Swaragh 013Author Commented:

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Regular Expressions

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