One of the things that I often end up doing is using JavaScript’s replace function with a regular expression and a callback function. Recently, though, I have been thinking about redeveloping an HTML application (HTA) that I made a long time ago for PCs. This HTA gave me the ability Read more…
One of the nice things that many people don’t know about JavaScript String replace() function is the fact that the second parameter can either be a string or a callback function. This callback function receives the entire matched substring, each parenthesized group (if not found the empty string is passed), Read more…
Sometimes you may have to use Textwrangler, SublimeText, Notepad++, or whatever IDE to search for a string which contains something commonly found outside of a string. For example, what if you want to find a string that in a Python file that had a hash symbol. In this case you Read more…
If you create a regular expression and set its global flag to true, it is important to note that if you want to test multiple strings against that RegExp using the test() function you will most-likely want to zero out the regular expression’s lastIndex property. Take the following code for Read more…
If you want to validate virtually any date (formatted as YYYY/MM/DD or YYYY-MM-DD) in JavaScript with a regular expression, you can use the following (fixed on August 8, 2013): This was actually inspired by the regular expressions from this post. Of course, the best way to check a date’s validity Read more…
Someone had an issue today where they were using a string as if it were a regular expression. Not totally understanding what the desired end result would be, I had suggested they use something equivalent to Java’s Pattern.quote() function. It turned out that they really just wanted to determine if Read more…
One of the things that I love about string manipulation is the existence of regular expressions. For this reason, I have decided to share a few examples that may help those who are learning about regular expressions so that can understand them a bit better. JavaScript – General Variable Name Read more…
There have been many times when I needed to simply modify the flags (options) for a regular expression in JavaScript. Unfortunately, the global, ignoreCase, multiline, and sticky (for FireFox) flags are immutable. In addition, when creating a new regular expression from an old one, you can’t supply a regular expression Read more…
One of the nice things about JavaScript is its functional nature. This is especially nice when it comes to dealing with strings and regular expressions. For instance, in JavaScript, you can use the following code to capitalize every other letter in a string: Cool stuff, right? Wouldn’t it be nice Read more…
After reviewing this page, I realized that I need to fix some of the ways that jPaq converts wildcard expressions into regular expressions. The first thing I need to do is have the @ character act as a meta-character equivalent to the + meta-character in a regular expression. The next Read more…