EqualFoldWithoutChars checks string `s1` and `s2` equal case-insensitively, with/without chars '-'/'_'/'.'/' '.

IsLetter checks whether the given byte b is a letter.

IsLetterLower checks whether the given byte b is in lower case.

IsLetterUpper checks whether the given byte b is in upper case.

IsNumeric checks whether the given string s is numeric.

NewReadCloser creates and returns a RepeatReadCloser object.

NewReadCloserWithReadCloser creates and returns a RepeatReadCloser object with given io.ReadCloser.

RemoveSymbols removes all symbols from string and lefts only numbers and letters.

ReplaceByMap returns a copy of `origin`, which is replaced by a map in unordered way, case-sensitively.

SplitAndTrim splits string <str> by a string <delimiter> to an array, and calls Trim to every element of this array.

StripSlashes un-quotes a quoted string by AddSlashes.

Trim strips whitespace (or other characters) from the beginning and end of a string.

UcFirst returns a copy of the string s with the first letter mapped to its upper case.

DefaultTrimChars are the characters which are stripped by Trim* functions in default.

ReadCloser implements the io.ReadCloser interface which is used for reading request body content multiple times.