在PHP中使用正则表达式删除特殊字符

Question

I have this input string: '- - Adele Gislan - Web Developer - - - '
and the expected output is this string: Adele Gislan - Web Developer

I use this regular expression

$urli='- - Adele Gislan - Web Developer - - - ';
$urli = preg_replace("/\-[[:space:]]+$/","",$urli);
$urli = preg_replace("/\-+$/","",$urli);

But this remove special character "-" or "- " only one time.

I try this

$urli = rtrim($urli, '-');
$urli = ltrim($urli, '-');

but isnt ideal

Answer 1

You need to include the space and - symbol inside a character class,

^[ -]+|[ -]+$

Just replace the matched characters with an empty string.

DEMO

PHP code would be,

<?php
$mystring = "- - Adele Gislan - Web Developer - - - ";
echo preg_replace('~^[ -]+|[ -]+$~', '', $mystring);
?>

Output:

Adele Gislan - Web Developer

Explanation:

• ^ Asserts that we are at the start.
• [ -]+ Matches one or more space or - characters.
• | Logical OR operator which is usually used to combine two regexes.
• [ -]+ Matches one or more space or - characters.
• $ Asserts that we are at the end of the line.