javascript - 替换javascript中的空格和换行符

Question

我想删除新行周围的任何空格，从

Here is a new line. /n 
New line.

至

Here is a new line./n
New line.

我找到了各种示例如何删除空格以及如何删除新行，但没有找到如何用简单的 /n 替换 ' '+/n 的示例。我尝试了以下方法，但没有奏效：

paragraphs = paragraphs.replace(/(\r\n|\n|\r|' '+\n|' '+\r|\n+' '|\r+' ')/gm,'<br>'); 

更新：

这就是我解决它的方法：paragraphs = paragraphs.replace(/\r\n|\n|\r/gm,'\n'); // 清除空元素数组（双新行）paragraphs = $.grep(paragraphs,function(n){ return(n) }); // 清除 (p=0;p) 的所有双空格的文本

Answer 1

我没有看到问题，以下不起作用吗？

var paragraph = "my paragraph with a space at the end \nand a new line";
paragraph.replace(/ \n/, "\n");

// or with multiple spaces, this is working too:
paragraph = "my paragraph with lot of spaces    \nzzzzz".replace(/ +\n/, "\n");

// or, for the more complete regex you want 
paragraphs = paragraphs.replace(/ [ \r\n]+/gm, "\n");

Answer 2

paragraphs = paragraphs.replace(/\ +\n/g,'\n');

Answer 3

您使用的正则表达式/(\r\n|\n|\r|' '+\n|' '+\r|\n+' '|\r+' ')/gm 没有按照您的意图进行；该'+ 部分匹配 1+ 个'字符；要匹配单个空格字符，只需键入空格（不带撇号），你应该这样写（如果我错了，请纠正我）：/\r\n|\s+\n|\s+\r|\n+|\r+/g并像这样使用它：p.replace(/\r\n|\s+\n|\s+\r|\n+|\r+/g,"\n<br>")，或者试试这个功能：

//
var ws_nls_ws_2_nl =
( function ( sc, ws_nls_ws_rgx, str_trim_rgx, nl ) {
  return function ( input_txt ) {
    // split on "\n+" surounded by blanks
    // join with "\n"
    // trim the result string
    return sc( input_txt ).split( ws_nls_ws_rgx ).join( nl ).replace( str_trim_rgx, "" );
  };
} )(

  // get global String ctor
  ( function () { return String; } )(),

  // new line(s) with blanks around it, global
  /[\s\uFEFF\xA0]+(?:\n+|(?:\r\n)+|\r+)[\s\uFEFF\xA0]+/g,

  // str-trim reg, 
  // blanks at start or end
  /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,

  "\n"

);
//
//  ws_nls_ws_2_nl("        Here is a new line.  \n   New line.   ");
//
//

Answer 4

Answer 5

可能您可以将字符串拆分为 \n 并应用 jQuery.trim()

Answer 6

好吧，这就是我最终清理输入文本字段的方式：

function cleanText(){
//aligns all new lines and splits text into single paragraphs
paragraphs = input.replace(/\r\n|\n|\r/gm,'\n');
paragraphs = paragraphs.split('\n');
// clears array of empty elements (double new lines)
paragraphs = $.grep(paragraphs,function(n){ return(n) });
// clears text of all double whitespaces
for (p=0;p<paragraphs.length; p++){
    paragraphs[p] = paragraphs[p].replace(/\s+/g, ' ');
    paragraphs[p] = $.trim(paragraphs[p]);
}
// joins everything to one string
var cleanedText = paragraphs.join("\n ") ;
// gets an array of single words
wordsArray=cleanedText.split(' ');
}