If you are looking for a tool in which to test or design regular expressions, I highly recommend Expresso here on Code Project. Standard regular expression syntax applies here. The find and replace sections allow you to enter a regular expression which you want to find and replace. Underneath this is the option to find in subdirectories as well. Once you open the program, you can select the directory to find and replace in.

Renaming several thousand files is not my idea of fun, so I wrote this program to find and replace across file names. If you want to standardize these file names, you would have to edit each filename separately. Consider you have a directory full of files that follow two different naming conventions – both contain the same information but just display it differently. At first you may find this would be a pretty strange thing to do. And then, with the tools in popular text editor apps, you could copy each email address out of your text.The purpose of this application is to allow you to find and replace files names using regular expressions. It could find all the characters around the symbol and select the full email address. A detailed regex script, though, could do better. So, if you're looking for email addresses, you could just search for with the normal Find tool to highlight every email address-along with anything that includes an symbol, though few things other than email addresses do. Want to find any number or the letter 'a'? |a would do the trick, as regex uses the pipe | character to mean or. We'd do a regex search for -that will search for anything containing at least one numeral (digits between 0 and 9). Regex lets you tell the computer what type of text you're looking for, using its own syntax.

Regex-or REGular EXpressions-are what you'll use. What if you instead wanted to find any number in your text? Perhaps your sentence now says 'I bought 47 apples and 23 eggs' and you'd like a list of the numbers. For example, if you're looking for the number '47' in the sentence 'I bought 47 apples,' your program's Find tool would highlight the number 47 in that sentence. Press Control+ F or Command+ F, type in the word you want to find, and the app will highlight every time that word shows up in your text. You're likely familiar with the search tool built into most apps on your computer. Regex scripts look like long strings of random text, but they can be the most powerful way to find any text you want

Find and replace evernote client regex