For example, in some tools, you might search "id=([0-9])+" then in the replacement string you could use \1 to refer to whatever number matched the expression in the parentheses.

Python comes with regex support out of the box, as part of its standard library. Here, we’ll take a quick tour of the Python regular expression library and how to get the most out of it.

One example that has provided me benefit multiple times is a simple Java application that I can run against a String I’m considering as a regular expression token to be used with String.split.

Using RegEx in your code requires the RegEx object, located within the System.Text.RegularExpressions namespace. For a usage example, see Listing 1 below. The code in this example reads a string as ...

The real strength of regular expressions however, lies in the handling of repetition. To illustrate this let’s take the example of needing to determine if a string contains a valid phone number.

Write an expression that captures the station id (the leading part of the string, before an underscore) Write an expression that captures the place name Write an expression that captures each of the ...

When working with regular expressions in a shell script the norm is to use grep or sed or some other external command/program. Since version 3 of bash (released in 2004) there is another option: ...

Perhaps regular expression parsing is slower than string manipulation; I didn't run any performance analysis on the code samples presented here. But even if the regex-based code is a tad slower, the ...

You can specify “ (?i)” at the beginning of your regular expression string for case-insensitive matches. Example: (?i)https Invalid regular expression syntax will return no matches.

Let’s say we need a JavaScript function that will take a string of tagged text (that is, it contains Extensible Markup Language (XML) markup) and return only the tags (and not the text that the ...