A string specifying a regular expression to match what's to the left of the cursor.
一个指定正则表达式来匹配光标左边的内容的字符串。
A string specifying a regular expression to match what's to the right of the cursor.
一个指定正则表达式来匹配光标右边的内容的字符串。
Regular expression to match an empty string?
正则表达式匹配空字符串？
Regular expression to match an empty string?
正则表达式匹配空字符串？
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