如何替换后跟数字的＃标签？

Question

I want to replace as FALSE where the string contains a # followed by an integer.

This is my code:

$newlogicexpression = '#1 and (1743327.12 >  10)';
if( strpos( $newlogicexpression, '#' ) !== false ) {
    $newlogicexpression = str_replace('#', 'FALSE', $newlogicexpression);
    $this->logger->debug($newlogicexpression);
}

My expected result is: FALSE and (1743327.12 > 10)

My current output is: FALSE1 and (1743327.12 > 10)

Based on the post method, the integer that follows the # may differ.

The replacement need to happen at any position in the string.

Answer 1

There are many ways to do that.
For example, you can use this regular expression: #\d+

Therefore:

$newlogicexpression = '#1 and (1743327.12 >  10) and #2';
if( strpos( $newlogicexpression, '#' ) !== false ) {

    $newlogicexpression = preg_replace('/#\d+/', 'FALSE', $newlogicexpression);
    $this->logger->debug($newlogicexpression);

}