lookbehind

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How do I make a regex with a lookbehind assertion that still works at the start of a string

I need to emulate the behavior of \\b开发者_高级运维 at the start of a string, where I\'m adding additional characters to the set that count as a word boundary. Right now I\'m using something like:[详细]

2023-02-04 09:42 分类：问答
Regex - Combining positive and negative lookbehind

I am doing some replaces in some huge SSIS packages to r开发者_高级运维eflect changes in table- and column names.[详细]

2023-01-22 04:44 分类：问答
How can I use lookbehind in a C# Regex in order to skip matches of repeated prefix patterns?

How can I use lookbehind in a C# Regex in order to skip matches of repeated prefix patterns? Example - I\'m trying to have the expression match all the b characters following any number of a characte[详细]

2023-01-18 14:44 分类：问答
What's the technical reason for "lookbehind assertion MUST be fixed length" in regex?

For example,the regex below will cause failure reporting lookbehind assertion is not fixed length: #(?<!(?:(?:src)|(?:href))=["\\\']?)((?:https?|ftp)://[^\\s\\\'"<>()]+)#S[详细]

2023-01-17 09:39 分类：问答
Ruby 1.9 Regex Lookbehind Assertion & Anchors

Ruby 1.9 regex supports lookbehind assertion but I seem to have difficulty when passing anchors in the pattern. When anchors are passed in the lookahead assertion it runs just fine.[详细]

2023-01-09 18:21 分类：问答
Lazy Regex Match in .NET. What's wrong here?

In the following example I would like to retrieve the text between pMAINp and the first pMDSp. The regex has a look-behind and a look-ahead:[详细]

2023-01-04 18:22 分类：问答
How does the regular expression ‘(?<=#)[^#]+(?=#)’ work?

I have the following regex in a C# program, and have difficulties understanding it: (?<=#)[^#]+(?=#)[详细]

2023-01-04 03:21 分类：问答
Remove leading whitespaces using variable length lookbehind in RegExp

I\'m wondering if variable length lookbehind assertions are supported in JavaScript\'s RegExp engine?[详细]

2022-12-29 05:54 分类：问答
Backreferences in lookbehind

Can you use backreferences in a lookbehind? Let\'s say I want to split wherever behind me a character is repeated twice.[详细]

2022-12-29 02:04 分类：问答
Java RegExp ViewState

I am porting some functionality from a C++ application to java. This involves reading non-modifiable data files that contain regular expressions.[详细]

2022-12-28 11:47 分类：问答