// wink-nlp-utils
// NLP Functions for amplifying negations, managing elisions,
// creating ngrams, stems, phonetic codes to tokens and more.
//
// Copyright (C) GRAYPE Systems Private Limited
//
// This file is part of “wink-nlp-utils”.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
var rgx = require( './util_regexes.js' );
// ## string
// ### retainAlphaNums
/**
*
* Retains only apha, numerals, and removes all other characters from
* the input string, including leading, trailing and extra in-between
* whitespaces.
*
* @alias string#retainAlphaNums
* @param {string} str the input string.
* @return {string} input string after removal of non-alphanumeric characters,
* leading, trailing and extra whitespaces.
* @example
* retainAlphaNums( ' This, text here, has (other) chars_! ' );
* // -> 'This text here has other chars'
*/
var retainAlphaNums = function ( str ) {
return ( str
.replace( rgx.notAlphaNumeric, ' ')
.replace( rgx.spaces, ' ')
.trim()
);
}; // retainAlphaNums()
module.exports = retainAlphaNums;