You can use the backslash character (i.e.
\) to escape the regular expression special characters. For example:
$str = 'hello?'; $replaceWith = 'hey?'; $pattern = '/hello\?/'; echo preg_replace($pattern, $replaceWith, $str); // 'hey?'
Typically, you would surround your regular expression pattern within two forward slashes (e.g.
/pattern/). However, you may use any non-alphanumeric, non-backslash, non-whitespace character as a delimiter. In any case, the character you use for the delimiter (to enclose the pattern within), if that character exists in the pattern, you must escape it too. For example:
$str = 'hello/world'; $replaceWith = 'foo bar'; $pattern = '/hello\/world/'; echo preg_replace($pattern, $replaceWith, $str); // 'foo bar'
As you can see in the example
/ (forward slash) is used as a delimiter for the regular expression. This means that the
/ used in the
$pattern must be escaped, otherwise it will result in an error.
To escape a run-time string that may contain regular expression special characters, you can use the
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