使用 jQuery 将长字符串拆分为文本块

Question

我有一个很长的字符串，需要在数组中分割成单独的块，并使用预定义的长度限制块。一些规则适用：

如果限制剪切了一个词，那么这个词将被分离到下一个块中。
必须修剪切片（数组项的开头或结尾没有空格）。
特殊标点符号.,!?应该留在单词中，而不是发送到下一个块。

Original text: I am totally unappreciated in my time. You can run this whole park from this room with minimal staff for up to 3 days. You think that kind of automation is easy? Or cheap? You know anybody who can network 8 connection machines and debug 2 million lines of code for what I bid for this job? Because if he can I'd like to see him try.

Result with current code ["I am totally", " unappreciated in my time", ". You can run this whole", " park from this room with", " minimal staff for up to ", "3 days. You think that", " kind of automation is ea", "sy? Or cheap? You know", " anybody who can network ", "8 connection machines", " and debug 2 million line", "s of code for what I bid", " for this job? Because if", " he can I'd like to see h", "im try."]

...应该实际上是：

["I am totally", "unappreciated in my time.", "You can run this whole", "park from this room with", "minimal staff for up to 3", "days. You think that kind", "of automation is easy?", "Or cheap? You know anybody", "who can network 8", "connection machines and", "debug 2 million lines of", "code for what I bid for", "this job? Because if he", "can I'd like to see him", "try."]

如您所见，我仍然无法使用规则 2 和 3。

这是我当前的代码（你可以查看working demo in jsfiddle）：

function text_split(string, limit, pos, lines) {
    //variables
    if(!pos) pos = 0;
    if(!lines) lines = [];
    var length = string.val().length;
    var length_current;

    //cut string
    var split = string.val().substr(pos, limit);
    if(/^\S/.test(string.val().substr(pos, limit))) {
        //check if it is cutting a word
        split = split.replace(/\s+\S*$/, "");
    }

    //current string length
    length_current = split.length;

    //current position
    pos_current = length_current + pos;

    //what to do
    if(pos_current < length) {
        lines.push(split);
        return text_split(string, limit, pos_current, lines);
    } else {
        console.log(lines);
        return lines;
    }
}
$(function(){
    $('#button').click(function(){
        text_split($('#textarea'), 25);
    });
});

演示的 html 表格：

<textarea id="textarea" rows="10" cols="80">I am totally unappreciated in my time. You can run this whole park from this room with minimal staff for up to 3 days. You think that kind of automation is easy? Or cheap? You know anybody who can network 8 connection machines and debug 2 million lines of code for what I bid for this job? Because if he can I'd like to see him try.</textarea>
<button id="button">demo</button>

Answer 1

最多 25 个字符的示例，您可以使用此模式：

/\S[\s\S]{0,23}\S(?=\s|$)/g

demo

代码示例：

var text = " I am totally unappreciated in my time. You can run this whole park from this room with minimal staff for up to 3 days. You think that kind of automation is easy? Or cheap? You know anybody who can network 8 connection machines and debug 2 million lines of code for what I bid for this job? Because if he can I'd like to see him try.";

var myRe = /\S[\s\S]{0,23}\S(?=\s|$)/g;
var m;
var result = new Array();

while ((m = myRe.exec(text)) !== null) {
   result.push(m[0]);
}
    
console.log(result);

注意：如果您需要动态选择最大大小，则必须使用替代语法来定义您的 RegExp 对象：

var n = 25;
var myRe = new RegExp("\S[\s\S]{0," + (n-2) + "}\S(?=\s|$)", "g");

图案详情：

\S             # a non-space character (it is obviously preceded by a space 
               # or the start of the string since the previous match
               # ends before a space)

[\s\S]{0,23}   # between 0 or 23 characters

\S(?=\s|$)     # a non-space character followed by a space or the end of the string

注意(?=\s|$)可以换成(?!\S)。

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