Extract dollar amount from string - regex in PHP

preg_match('/\$([0-9]+[\.,0-9]*)/', $str, $match);
$dollar_amount = $match[1];

will be probably the most suitable one

Try this:

if (preg_match('/(?<=\$)\d+(\.\d+)?\b/', $subject, $regs)) {
    #$result = $regs[0];
}

Explanation:

"
(?<=     # Assert that the regex below can be matched, with the match ending at this position (positive lookbehind)
   \$       # Match the character “\$” literally
)
\d       # Match a single digit 0..9
   +        # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
(        # Match the regular expression below and capture its match into backreference number 1
   \.       # Match the character “.” literally
   \d       # Match a single digit 0..9
      +        # Between one and unlimited times, as many times as possible, giving back as needed (greedy)
)?       # Between zero and one times, as many times as possible, giving back as needed (greedy)
\b       # Assert position at a word boundary
"