--: 作者：不知百度知 2022年9月 [TOC] ## 1.在线测试regex https://regex101.com/ ## 2.常用规则 * A single character of: a, b or c \[abc\] * A character except: a, b or c \[^abc\] * A character in the range: a-z \[a-z\] * A character not in the range: a-z \[^a-z\] * A character in the range: a-z or A-Z \[a-zA-Z\] * Any single character . * Alternate - match either a or b a|b * Any whitespace character \\s * Any non-whitespace character \\S * Any digit \\d * Any non-digit \\D * Any word character \\w * Any non-word character \\W * Match everything enclosed (?:...) * Capture everything enclosed (...) * Zero or one of a a? * Zero or more of a a\* * One or more of a a+ * Exactly 3 of a a{3} * 3 or more of a a{3,} * Between 3 and 6 of a a{3,6} * Start of string ^ * End of string $ * A word boundary \\b * Non-word boundary \\B