B4J Question Regex help (I love, hate and don't know it!)

[LucaMs]

This line:

ExtraChars = Regex.Replace ("([^a-z])", ExtraChars, "")

should "remove" all lowercase letters from ExtraChars (replace with empty strings).

If ExtraChars is: "5?" it removes all.

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Actually, the complete thing I would need is a regex expression to accept any letters and special characters passed by the user (ExtraChars parameter).

 

[Star-Dust]

.replace( "/[a-z]/g","")

Remove all non-lower case characters from string

I understand that given a string str str.replace(/\s/g,''); will remove all spaces in a string. How can I remove all characters that are not lower case letters from the string?

stackoverflow.com

 

[LucaMs]

ExtraChars = "ab12"
ExtraChars = Regex.Replace("([^a-z])", ExtraChars, "")

Result: ab
then it does not replace letters, keeps them

 

[Star-Dust]

ExtraChars = "ab12"
ExtraChars = Regex.Replace("([^a-z])", ExtraChars, "")

Result: ab
then it does not replace letters, keeps them

With the symbol ^ invert, so it substitutes for those that are not lowercase

 

[LucaMs]

ExtraChars = Regex.Replace("([a-zA-Z0-9])", ExtraChars, "")

works. Thank you, @Star-Dust