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10 paź 2016 · var output = input.replace(/(\/\d+\/)small_image\/\d*x/, "$1thumbnail"); console.log(output); Explanation: Put the part you want to keep in parentheses, then refer to that as $1 in the replacement string - don't put $1 in your regex.
In order to replace a part of a match, you need to either 1) use capturing groups in the regex pattern and backreferences to the kept group values in the replacement pattern, or 2) lookarounds, or 3) a \K operator to discard left-hand context.
Substitution in regex refers to the process of replacing matches of a pattern with a specified replacement string. It allows you to transform or modify text based on the matches found in the input string.
We added -E to get extended regex syntax. [:digit:] and [:alpha:] are used in place of 0-9 and A-Z in order to be unicode safe. Parens are used to create groups and we can reference in the replacement text. In our case, \1 references the number and \2 references the letter.
29 sie 2024 · A replacement string, also known as the replacement text, is the text that each regular expression match is replaced with during a search-and-replace. In most applications, the replacement text supports special syntax that allows you to reuse the text matched by the regular expression or parts thereof in the replacement.
20 paź 2020 · How to use RegEx with .replace in JavaScript. To use RegEx, the first argument of replace will be replaced with regex syntax, for example /regex/. This syntax serves as a pattern where any parts of the string that match it will be replaced with the new substring. Here's an example:
15 wrz 2021 · Make substitutions to replace matched text using regular expressions in .NET. Substitutions are language elements recognized only within replacement patterns.
