Regular expressions

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Hi,

I need some regular expressions but don't know how to create them.
If somebody knows a good, easy to use, readable tool. Please tell me.

I have a textbox.
- The user must enter data. (it may not be empty)
- The data lenght must be between 1 to 255.
- The user may add data on multiple lines. (some lines may be left empty)
- The data is not case-sententive.
- All chars are accepted.

Can someone help me with this one?

Thanks!


.

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