You can use curly braces to control the number of occurrences. For example, this means 0 to 10:

/^[a-z]{0,10}$/

The options are:

  • {3} Exactly 3 occurrences;
  • {6,} At least 6 occurrences;
  • {2,5} 2 to 5 occurrences.

See the regular expression reference.

Your expression had a + after the closing curly brace, hence the error.

正则表达式基本用法（一）——字符重复出现的次数、文字或(|)、文字 ...

https://blog.csdn.net/u010332284/article/details/78180298

2017年10月9日 ... "ab{3,5}"：表示一个字符串有一个a跟着3到5个b。 请注意，你必须指定范围的下限 （如："{0,2}"而不是"{,2}"）。

12 Using Regular Expressions With Oracle Database

https://docs.oracle.com/cd/B12037_01/appdev.101/b10795/adfns_re.htm

A regular expression can specify complex patterns of character sequences. ... for a specified number of occurrences, or more, of the preceding character or ...

Java正则表达式，指定字符出现指定次数，怎么写? - OSCHINA ...

https://www.oschina.net/question/3730436_2316648

比如，一个字符串，09:15和09:15:30， 想根据:出现次数匹配。

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https://blog.csdn.net/qq_43251559/article/details/105564280

2020年4月16日 ... 求字符串中指定字符串出现次数利用indexof函数返回指定字符串第一次出现的位置 for(int i = 1;i < chapters.length;i++) { String content = chapters[i] ...

Use regular expressions - Visual Studio | Microsoft Docs

https://docs.microsoft.com/en-us/visualstudio/ide/using-regular-expressions-in-visual-studio

Sep 13, 2019 ... Learn about some regular expression characters, operators, ... Specify the number of occurrences of the preceding character or group.

Java正则表达式，指定字符出现指定次数，怎么写? Java报错-问答 ...

https://developer.aliyun.com/ask/294150

2020年6月1日 ... 比如，一个字符串，09:15和09:15:30， 想根据:出现次数匹配。

grep 结合正则表达式二连续次数的匹配- 华为云

https://www.huaweicloud.com/articles/7d99089e1b31115d624d33e340e7222e.html

2021年2月7日 ... grep 结合正则表达式二连续次数的匹配2 "{x}"表示前面的字符连续出现x次将会被 匹配到需要注意的是，如果字符连续出现的次数大于指定的次数， ...

Python RE 正则表达式模块- lyshark - 博客园

https://www.cnblogs.com/LyShark/p/12163340.html

2020年1月7日 ... 匹配前一个字符出现1次或0次^ 匹配以指定. ... Python RE 正则表达式模块 ... 匹配 前一个字符出现次数(x{m}) 匹配前一个字符x,出现过m次的行. > ...

Regular Expressions

https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html

While many regular expressions can be interpreted differently depending on the ... Matching shall be based on the bit pattern used for encoding the character, not ... number of occurrences and n specifies the maximum number of occurrences.

Quantifiers in Regular Expressions | Microsoft Docs

https://docs.microsoft.com/en-us/dotnet/standard/base-types/quantifiers-in-regular-expressions

Mar 30, 2017 ... Learn about regular expression quantifiers, which specify how many instances of a character, group, or character class must be present in the ...

python大佬养成计划----正则表达式- SegmentFault 思否

https://segmentfault.com/a/1190000016716989

2018年10月17日 ... re 模块使Python 语言拥有全部的正则表达式功能。 compile 函数根据一个 ... pattern 匹配的正则表达式string 要匹配的字符串 ... 指定字符出现次数.

sql server 查询字符串指定字符出现的次数- Liwuyi - 博客园

https://www.cnblogs.com/liwuyi/p/5525793.html

2016年5月25日 ... 这里提取指定符串"A"在字段中的出现次数SQL为： select ... 原理：用replace函数 将要查找的字符替换为空字符，将替换之间的字符串长度-替换后字符 ... 正则表达式 学习日记(2) · 3. sql server 查询字符串指定字符出现的次数(1) · 4.

FileLocator Pro - *, ?, + (Occurrence characters)

https://mythicsoft.com/filelocatorpro/help/en/index.html?(occurrencecharacters).htm

Specifies the number of occurrences of the preceding character or group. In a regular expression there are four possible choices when trying to specify how ...

Match regular expression (case sensitive) - MATLAB regexp

https://www.mathworks.com/help/matlab/ref/regexp.html

The regular expression '\w*x\w*' specifies that the character vector: Begins with any ... Find both uppercase and lowercase instances of a word. By default ...

Regular Expressions: Regexes in Python (Part 1) – Real Python

https://realpython.com/regex-python/

Apr 29, 2020 ... A regex is a special sequence of characters that defines a pattern for complex ... The re module contains many useful functions and methods, most of which you'll ... This matches zero or more occurrences of any character.

Regular expression syntax

https://helpx.adobe.com/coldfusion/developing-applications/the-cfml-programming-language/using-regular-expressions-in-functions/regular-expression-syntax.html

Sep 30, 2019 ... For example, the regular expression "[ A-Za-z] " specifies to match any single ... bracket specifies to match zero or more occurrences of the character set. ... The regular expression "(ha)+" matches one or more instances of "ha".

Regular expression to limit number of characters to 10 - Stack ...

https://stackoverflow.com/questions/1649435/regular-expression-to-limit-number-of-characters-to-10

You can use curly braces to control the number of occurrences. For example, this means 0 to 10: /^[a-z]{0,10}$/. The options are: {3} Exactly 3 ...

Pattern Matching With Regular Expressions - Mantid Project

https://www.mantidproject.org/Pattern_Matching_With_Regular_Expressions

At their simplest, a regular expression is simply a string of characters and this ... that lets us specify things such as 'a number is in a range', 'a letter is one of a set', ... regex: 'a*b' test: 'b' # Matches as there are no occurrences of 'a' test: 'ab' ...