I hope the form input value not contains any backspace or linefeed char, so I use the Validators.pattern to do, but failed, how this reg should be?
Validators.pattern(/(?![\b|\n])/)
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3 Answers
The (?![\b|\n]) pattern presents a negative lookahead that matches a location that is not followed with a backspace, | or a newline. It does not guarantee that the whole string does not match this pattern.
You are looking for
Validators.pattern(/^[^\b\n]+$/)
Or
Validators.pattern("[^\b\n]+")
Note that string patterns are wrapped in ^...$ (="anchored") automatically.
Pattern details
^- start of string[^- start of a negated character class\b- a backspace (inside a character class, it is always parsed as a backspace)\n- an LF symbol
]+- end of the character class, repeat 1+ times$- end of string.
Comments
Try putting the argument in quotes : Validators.pattern('/(?![\b|\n])/')