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![情景<br />忘记大写还是小写：<br />hi还是Hi<br />搜两遍？试试正则吧<br />(h|H)i<br />[Hh]i<br />注<br />](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-7-2048.jpg?cb=1668627828)
![最简单的正则表达式<br />只想要这个结果：<br />hi<br />改成这个：<br />\b(H|h)i\b<br />\bhi\b<br />\b[Hh]i\b<br />那么只匹配：hi<br />](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-9-2048.jpg?cb=1668627828)
![然后呢？<br />\b \w \d () [] \W \s \S ……这些都是什么意思？<br />(?>) (?<=) (?<!) (?P<name>) \p{Inname}这些又是些什么呢？<br />\x{4e...](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-11-2048.jpg?cb=1668627828)
![[] 字符组，字符范围](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-31-2048.jpg?cb=1668627828)
![…… 等等</li></li></ul><li>正则表达式<br />字符组：<br /><ul><li>[0-9] 数字0到数组9之间的任意一个](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-33-2048.jpg?cb=1668627828)
![[a-z] 字母a到字母z的任意一个](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-34-2048.jpg?cb=1668627828)
![[^cfC] 除了字母 c f C的任意一个字符](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-35-2048.jpg?cb=1668627828)
![[\u4e00-\u9fa5] 汉字中的任意一个汉字 注](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-36-2048.jpg?cb=1668627828)
![[^a-z] 除了字母 a 到字母z的任意一个字符](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-37-2048.jpg?cb=1668627828)
![[^-a-c] 除了 - 字符以及字母a到字母z的任意一个字符](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-38-2048.jpg?cb=1668627828)
![\1 \2 … 反向引用 < (\w)>.*</\1> 引用第一个捕获组的结果，用于匹配html的闭合标签</li></ul>表达式 [^Win] ，匹配字符串Windows 的结果是什么呢？<br />表达式 ab|cd，能匹配aabd吗？a...](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-40-2048.jpg?cb=1668627828)
![“[ ]”<br />方括号“[ ]”匹配指定一堆字符中的一个。<br />表达式：<br />^[a-z]at$<br />能匹配的字符串（举例）：<br />cat<br />mat<br />zat<br />](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-43-2048.jpg?cb=1668627828)
![“[ ]”<br />方括号“[ ]”匹配指定一堆字符中的一个。<br />表达式：<br />^[A-Za-z]at$<br />能匹配的字符串（举例）：<br />Cat<br />cat<br />Mat<br />](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-44-2048.jpg?cb=1668627828)
![“[ ]”<br />方括号“[ ]”匹配指定一堆字符中的一个。<br />表达式：<br />^[aeiou]at$<br />能匹配的字符串（举例）：<br />aat<br />eat<br />iat<br />](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-45-2048.jpg?cb=1668627828)
![重复符号“+”<br />“+”表示前一字符模式可以被重复1次或n次。<br />表达式：<br />^g[aeiou]+gle$<br />能匹配的字符串（举例）：<br />gagle<br />gegle<br />geagle<br /...](https://image.slidesharecdn.com/regularexpressions-110926223753-phpapp01/75/-47-2048.jpg?cb=1668627828)
