正则表达式检查一个字符的 3 个或更多连续出现 [英] RegEx to check 3 or more consecutive occurrences of a character
问题描述
我想检查输入字符串以验证正确的文本.
I want to check an input string to validate a proper text.
一个.我希望用户允许编写字母数字字符，包括句点、逗号、连字符和圆括号 ()
a. I want the users to allow to writer alphanumeric characters including period, comma, hyphen and round bracket ()
B.但是，我不希望用户一起输入 3 位或更多位的数字.例如:12 是允许的，而 185 是不允许的.
b. However, i dont want the users to enter a NUMBER with 3 or more digits together. eg: 12 is allowed while 185 is NOT.
c.我不希望用户输入……"或--------"或aaaaaaaaaaaaaa"或bbbbbbbb"等字符串.
c. I dont want the users to enter strings like "............." or "----------" or "aaaaaaaaaaaaaa" or "bbbbbbbb" etc.
请建议相同的正则表达式.
Please suggest the regular expression for the same.
推荐答案
您可以使用正则表达式:
You can use the regex:
(?!.*(.)\1{2})^[a-zA-Z0-9.,()-]*$
它使用负前瞻(?!.*(.)\1{2}) 来确保没有任何字符的 3 组重复.
It uses the negative lookahead (?!.*(.)\1{2}) to ensure that there is no group of 3 repetitions of any of the characters.
然后它使用正则表达式 ^[a-zA-Z0-9.,()-]*$ 来确保字符串仅由字母、数字、句点、逗号、括号组成和连字符.
Then it uses the regex ^[a-zA-Z0-9.,()-]*$ to ensure that the string is made of just alphabets, numbers, period, comma, parenthesis and hyphen.
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