php does not ambiguous include expressions

Unambiguous inclusion expression means that when matching a string, it must match completely, instead of only matching part of the characters. In PHP, you can use the preg_match function to implement regular expression matching.

For example, assuming that the string that needs to be matched is "hello world", you can use the following regular expression:

/^hello world$/

where, ^ means matching the beginning of the string, $ means matching the end of the string . This ensures that only identical strings are matched, without ambiguous inclusions.

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