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How would I make a regular expression to match the character < not followed by (a or em or strong)
So <hello and <string would match, but <strong wouldn't.
424
To match any character except a list of excluded characters, put the excluded charaters between [^ and ] . The caret ^ must immediately follow the [ or else it stands for just itself. The character '. ' (period) is a metacharacter (it sometimes has a special meaning).
Most characters, including all letters ( a-z and A-Z ) and digits ( 0-9 ), match itself. For example, the regex x matches substring "x" ; z matches "z" ; and 9 matches "9" . Non-alphanumeric characters without special meaning in regex also matches itself. For example, = matches "=" ; @ matches "@" .
Using m option allows it to match newline as well. Matches any single character in brackets. Matches 0 or more occurrences of preceding expression. Matches 1 or more occurrence of preceding expression.
Try this:
<(?!a|em|strong) You use a negative lookahead, the simplest form for which is (for this problem):
<(?!a|em|strong) The one issue with that is that it will ignore <applet>. A way to deal with that is by using \b, which is a zero-width expression (meaning it captures none of the input) that matches a word to non-word or non-word to word transition. Word characters are [0-9a-zA-Z_]. So:
<(?!(a|em|strong)\b) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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