Which regular expression query modifier function indicates the start of a string?

The caret '^' symbol is a special character in regular expressions that asserts the position at the start of the string or the start of a line, depending on the regex engine's mode.

`[^]` denotes a negated character set, meaning it matches any character that is NOT inside the brackets. It does not indicate the start of a string.

The plus sign `+` is a quantifier that matches one or more occurrences of the preceding character or group. It does not indicate the start of a string.

The dollar sign `$` is an anchor that matches the end of a string or the end of a line, not the start.