Regex with exclusion chars and another regex

问题

How to write regex which find word (without whitespace) that doesn't contain some chars (like * or #) and sentence also (like level10 or level2 - it should be also regex - level[0-9]+). It will be simple for chars excluded ([^\\s^#^*]+) but how to exclude this 'level' example too ?

I want to exclude chars AND level with number.

1. Examples:
   • weesdlevel3fv - shouldn't match because of 'level3'
   • we3rlevelw4erw - should match - there is level without number
   • dfs3leveldfvws#3vd - shouldn't match - level is good, but '#' char appeared
   • level4#level levelw4_level - threat as two words because of whitespaces - only second one should match - no levels with number and no restricted chars like '#' or '*'

回答1:

See this regex:

/(?<=\s)(?!\S*[#*])(?!\S*level[0-9])\S+/

Regex explanation:

• (?<=\s) Asserts position after a whitespace sequence.
• (?!\S*[#*]) Asserts that "#" or "*" is absent in the sequence.
• (?!\S*level[0-9]) Asserts that level[0-9] is not matched in the sequence.
• \S+Now that our conditionals pass, this sequence is valid. Go ahead and use \S+ or \S++ to match the entire sequence.

To use lookaheads more exclusively, you can add another (?!\S*<false_to_assert>) group.

View a regex demo!

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For this specific case you can use a double negation trick:

/(?<=\s)(?!\S*level[0-9])[^\s#*]+(?=\s)/

Another regex demo.

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Read more:

• Regex for existence of some words whose order doesn't matter

回答2:

you can simply OR the searches with the pipe character [^\s#*]+|level[0-9]+

来源：https://stackoverflow.com/questions/25145307/regex-with-exclusion-chars-and-another-regex