Question
In regular expressions, the [...] charactor signifies exactly one of any charactors except line break (e.g. a [...] c matches abc, adc, etc)
"."

Question
In regular expressions, the [...] charactor signifies exactly one of any charactors except line break (e.g. a [...] c matches abc, adc, etc)
?

Question
In regular expressions, the [...] charactor signifies exactly one of any charactors except line break (e.g. a [...] c matches abc, adc, etc)
"."
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5. Regular Expressions
hat any character can take its place. This is said to be a wildcard and works with file names. With regular expressions, the wildcard to use is the . character. So, you can use the command grep <span>.3....8 <filename> to find the seven-character telephone number that you are looking for in the above example. Regular expressions are used for line-by-line searches. For instance,

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status measured difficulty not learned 37% [default] 0

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