# Functions
Contains returns true, if the specified slice contains the specified element, false otherwise.
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GetOnlyLetters returns a string containing only letters from given string.
GetOnlyNumbers returns a string containing only numbers from given string.
GetSignedNumbers returns a string containing only positive and negative numbers from given string.
HasLetters returns true when string contains a letter [a-zA-Z].
HasNumbers returns true when string contains a letter [0-9].
HasOnlyLetters returns true when string contains only letters.
HasOnlyNumbers returns true when string contains only numbers.
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Remove takes a slice of strings and returns a slice with the first occurrence of the string value removed.
SplitAndTrim split the string based on the separator passed.