XRegExp is an open source JavaScript library that provides an augmented, extensible, cross-browser implementation of regular expressions, including support for additional syntax, flags, and methods.

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watermark.js is a js library for creating watermarks on images. Images with a classname of your choice (default “watermark”) will get processed and then apply your watermark. Your watermark doesn’t have to be a .PNG or .GIF with transparency, watermark.js creates transparency even if you defined a .JPG as your watermark picture.