Buttons. The professional association for design. The complete set of 50 passenger/pedestrian symbols developed by AIGA is available for all to use, free of charge.
Signs are available here in EPS and GIF formats. Additional symbol signs are available free of charge at The Noun Project. Download the complete set of Symbol Signs (ZIP archive, 377 KB) Regular Expressions Reference - Basic Syntax. The regular expressions reference on this website functions both as a reference to all available regex syntax and as a comparison of the features supported by the regular expression flavors discussed in the tutorial.
The reference tables pack an incredible amount of information. To get the most out of them, follow this legend to learn how to read them. The tables have six columns for each regular expression feature. The first four explain the feature. The final two columns indicate whether your two chosen regular expression flavors support this particular feature. 25 HTML5.