Unmatchable caret in regular expression¶
The caret character
^ in a regular expression only matches at the beginning of the input, or (for multi-line regular expressions) at the beginning of a line. If it is preceded by a pattern that must match a non-empty sequence of (non-newline) input characters, it cannot possibly match, rendering the entire regular expression unmatchable.
Examine the regular expression to find and correct any typos.
In the following example, the regular expression
/\[^.]*\.css/ cannot match any string, since it contains a caret assertion preceded by an escape sequence that matches an opening bracket.
if (file.match(/\[^.]*\.css/)) console.log("Found it.");