在Javascript或jQuery中，如何仅删除第一个和最后一个标记？

Question

given the following string:

var htmlStr = '<p class="red_349dsa01">This is</p><p class="blue_saf9vsaz">a test</p>';

how can I remove the very first and last tag off this string? This would be the result:

var htmlStr = 'This is</p><p class="blue_saf9vsaz">a test';

I know this will create invalid HTML, but I just want to know if this can be done at all.

Answer 1

You would need a regular expression here:

var regex = /(?:^<p[^>]*>)|(?:<\/p>$)/g;
var htmlStr = '<p class="red_349dsa01">This is</p><p class="blue_saf9vsaz">a test</p>';  
htmlStr.replace(regex, "");

An explanation of the regex:

1. The first part (?:^<p[^>]*>) uses the caret ^ character to match the start of the string,
2. then <p will match the start of the opening p tag,
3. [^>]* will match any character except the > character,
4. the | splits the expression into two, one in each pair of braces where either can be matched,
5. the <\\/p>$ expression will match a closing </p> tag only if it is right at the end of the string by using the $ character.

Answer 2

You could try something like

var htmlStr = '<p class="red_349dsa01">This is</p><p class="blue_saf9vsaz">a test</p>';
alert(htmlStr.substring(htmlStr.indexOf('>') + 1, htmlStr.lastIndexOf('<')));