function _is_regex in Slickgrid 7.2

Helper function Returns TRUE if $str is a regular expression, according to the following rules:

• Does the string start and end with the same character? (non alphanumeric, excluding whitespaces and backslashes)
• Does the string contain "*" or or '?' or '$' or '^' or "[" and "]"?

1 call to _is_regex()

slickgrid_get_data in includes/slickgrid.getdata.inc

Return the data for a dynamically loaded SlickGrid.

File

includes/slickgrid.getdata.inc, line 244

Code

function _is_regex($str) {
  $first_char = substr($str, 0, 1);
  $last_char = substr($str, -1);

  // You can use any non alphanumeric delimiter (excluding whitespaces and backslashes)
  if (strlen($str) < 3 || $first_char != $last_char || ctype_alnum($first_char) || $first_char == " " || $first_char == "\\") {
    return false;
  }

  // Look for 'special' characters and return true if found
  $str = substr($str, 1, -1);
  if (strpos($str, '[') !== false && strpos($str, ']') !== false) {
    return true;
  }
  elseif (strpos($str, '*') !== false) {
    return true;
  }
  elseif (strpos($str, '?') !== false) {
    return true;
  }
  elseif (strpos($str, '$') !== false) {
    return true;
  }
  elseif (strpos($str, '^') !== false) {
    return true;
  }
  else {
    return false;
  }
}