The fourth bird questions

The fourth bird answers

• filemtime returns same value before and after modification of file
• How to match a string (?,?,?) in Java
• Place a dot before a letter
• Positive Lookbehind greedy
• Get particular parts from a string
• Ruby regex to allow A-Za-z0-9
• regex - how to capture pattern without different pattern before it?
• String replace with multiple dahses and spaces
• Regex to match path
• How is it possible to split a string by whitespaces, and also keep commas separate?