RegEx for matching operation sequences

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I have a numbers operation like this:


I need to extract operands, not implied in a multiplication operation with a regex:


I tried things like that without success:


This regex matches -5, too, and


matches nothing.

How do I solve this problem?

Patterns (Regular Expressions) – A Primer for Computational Biology, Each sequence header line encodes a variety of information: the second and third columns of the In particular, we'll focus on the s , or substitution, operation. A regular expression is a syntax for describing pattern matching in strings. Returns a match where the specified characters are at the beginning or at the end of a word: r"\bain" r"ain\b" Try it » Try it » \B: Returns a match where the specified characters are present, but NOT at the beginning (or at the end) of a word: r"\Bain" r"ain\B" Try it » Try it » \d: Returns a match where the string contains digits (numbers

This RegEx might help you to capture your undesired pattern in one group (), then it would leave your desired output:


You can also use other language specific functions such as (*SKIP)(*FAIL) or (*SKIP)(*F) and get the desired output:


You can also DRY your expression, if you wish, and remove unnecessary groups that you may not need.

re — Regular expression operations — Python 3.8.5 documentation, Either escapes special characters (permitting you to match characters like '*' , '?' , and so forth), or signals a special sequence; special sequences are discussed� Inspired by a thread on the Elasticsearch mailing list, we use a groovy script to run through each of the final matching sequences with the original regex. Originally we tried using the built-in Regexp Filter , but Elasticsearch would attempt to run it first, before any filtering from the boolean query, resulting in a slow scan over the entire

Regular Expression (Regex) Tutorial, To match a character having special meaning in regex, you need to use a escape A Sequence of Characters (or String): Strings can be matched via combining a expression operations @ (Python 3). A regex quantifier such as + tells the regex engine to match a certain quantity of the character, token or subexpression immediately to its left. For instance, in A+ the quantifier + applies to the character A

Package java.util.regex, An engine that performs match operations on a character sequence by interpreting a Pattern . Pattern. A compiled representation of a regular expression . A compiled representation of a regular expression. A regular expression, specified as a string, must first be compiled into an instance of this class. The resulting pattern can then be used to create a Matcher object that can match arbitrary character sequences against the regular expression. All of the state involved in performing a match

java.util.regex (Java SE 12 & JDK 12 ), Classes for matching character sequences against patterns specified by regular expressions. An instance of the Pattern class represents a regular expression that is specified in string form in a syntax similar The result of a match operation . A Java regular expression, or Java regex, is a sequence of characters that specifies a pattern which can be searched for in a text. A regex defines a set of strings, usually united for a given purpose. Suppose you need a way to formalize and refer to all the strings that make up the format of an email address.

This module provides regular expression matching operations similar to those found in Perl. Both patterns and strings to be searched can be Unicode strings (str) as well as 8-bit strings (bytes). However, Unicode strings and 8-bit strings cannot be mixed: that is, you cannot match a Unicode string with a byte pattern or vice-versa; similarly, when asking for a substitution, the replacement string must be of the same type as both the pattern and the search string.

  • What environment are you implementing this in?
  • Try (?<!\*)[-+]\d*\.?\d+(?![*\d])
  • @WiktorStribiżew What's this part for? \.?\d+?
  • @vintnes That would allow numbers which may contain decimals to be matched as well.
  • Thank you very much @WiktorStribiżew ! It's exactly what I was looking for ! It's works perfectly.