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Regex to replace everything except numbers and a decimal point

I have a text field that needs to remain only text or decimal. Here is the code that I'm currently using to replace everything except numbers and a decimal point. Issue is, I can't figure out a regex that will identify everything else ...
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awk without printing newline

I want the variable sum/NR to be printed side-by-side in each iteration. How do we avoid awk from printing newline in each iteration ? In my code a newline is printed by default in each iteration ...
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Adjust list style image position?

Is there a way to adjust the position of list-style-image? 16 Answers 16 ...
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(Deep) copying an array using jQuery [duplicate]

I need to copy an (ordered, not associative) array of objects. I'm using jQuery. I initially tried 8 Answers ...
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Most efficient way to make the first character of a String lower case?

What is the most efficient way to make the first character of a String lower case? 11 Answers ...
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PHP Function Comments

Just a quick question: I've seen that some PHP functions are commented at the top, using a format that is unknown to me: 4 ...
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Get item in the list in Scala?

How in the world do you get just an element at index i from the List in scala? 4 Answers ...
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100% Min Height CSS layout

In particular if you have a layout with a header and footer of fixed height , 13 Answers ...
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Is there a “null coalescing” operator in JavaScript?

Is there a null coalescing operator in Javascript? 13 Answers 13 ...
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Is short-circuiting logical operators mandated? And evaluation order?

Does the ANSI standard mandate the logical operators to be short-circuited, in either C or C++? 7 Answers ...