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3 min readBackreferencing a group when using "or" in regex can be done by using the pipe symbol "|" to separate the different options within the group. This allows you to reference the matched group later in the regex pattern. For example, if you have a regex pattern like "(apple|orange)", you can backreference the matched group by using \1 in your regex pattern. This will allow you to reuse the matched group in your regex pattern.
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4 min readTo extract specific information from a URL using regex, you first need to identify the pattern or format of the information you want to extract. Once you have a clear idea of the pattern, you can create a regular expression (regex) that matches that pattern.For example, if you want to extract all the words that come after a specific word or character in a URL, you can use a regex pattern that looks for that word or character followed by a certain number of alphanumeric characters.
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4 min readTo extract specific digits from a pandas column using regex, you can use the str.extract() function in pandas with a regular expression pattern that matches the desired digits. The regular expression pattern should include capturing groups () around the digits you want to extract. This will allow you to retrieve the specific digits from the column and create a new column or variable with just the extracted numbers.
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8 min readTo get the result of finding a string with regex, you need to use a programming language or tool that supports regular expressions. First, you need to define a regex pattern that matches the string you are looking for. Then, you can use functions or methods provided by the language or tool to search for the pattern within a given text or dataset. Once the regex search is performed, you can retrieve the matched string or strings as the result of the operation.
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5 min readTo match with the character "" but not with the sequence "/" in a regular expression (regex), you can use a negative lookbehind assertion. This allows you to specify a pattern that should not precede the character you are trying to match.One way to achieve this is by using the following regex pattern: (?<!/)\* In this pattern, the expression (?<.
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3 min readTo remove the dot from an email address before the @ symbol using regex, you can use the following pattern:/.+(?=[^@]*@)/gThis regex pattern matches any dot that occurs before the @ symbol in an email address. You can use this pattern in your programming language of choice to find and remove the dots from email addresses before the @ symbol.[rating:e7785e8d-0eb6-465d-af44-34e83936708a]What is the significance of extracting top-level domain from email addresses using regex.
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5 min readTo replace a string using regex in JavaScript, you can use the replace() method. This method takes two parameters: the regex pattern to search for and the replacement string.Here's an example: let str = "Hello, world!"; let newStr = str.replace(/hello/i, "Hi"); console.log(newStr); // Output: "Hi, world!" In this example, we're replacing the word "Hello" with "Hi" using a case-insensitive regex pattern.
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7 min readTo get multiple first matches from a regex pattern in Python, you can use the re.finditer() function provided by the re module. This function returns an iterator that allows you to loop through all the occurrences of the pattern in a string and extract the first match from each occurrence. By using a loop, you can extract multiple first matches from the string based on the provided regex pattern.
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4 min readTo get the list of replacement strings from a regex, you can use the re.sub function in Python. This function allows you to specify a pattern to search for in a string, and a replacement string to use when the pattern is found.You can also use regular expressions to extract specific parts of a string and use them in the replacement string.
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4 min readTo create a regular expression that excludes a certain character, you can use a negated character class. This involves placing a caret symbol (^) at the beginning of the character class to indicate that any character except those listed should be matched. For example, if you want to match any word that does not contain the letter "a", you can use the regular expression [^a]+. This will match one or more of any character except the letter "a".
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4 min readTo get rid of a portion of a string using regex, you can use the replace() function in most programming languages. You would specify the portion of the string you want to remove using a regular expression pattern and replace it with an empty string. For example, in JavaScript, you can do something like this: let originalString = "Hello world!"; let modifiedString = originalString.replace(/world/, ""); console.log(modifiedString); // Output: Hello .