string-parsing

问题 I\'m trying to convert numbers taken from a UITextField, which I presume, are actually strings, and convert them to float, so I can multiply them. I have two UITextfield s which are declared as follows: @IBOutlet var wage: UITextField @IBOutlet var hour: UITextField When the user presses a UIButton I want to calculate the wages the user earns, but I can\'t, as I need to convert them to floats first, before I can use them. I know how to convert them to an integer by doing this: var

问题 Over the years I have slowly developed a regular expression that validates MOST email addresses correctly, assuming they don\'t use an IP address as the server part. I use it in several PHP programs, and it works most of the time. However, from time to time I get contacted by someone that is having trouble with a site that uses it, and I end up having to make some adjustment (most recently I realized that I wasn\'t allowing 4-character TLDs). What is the best regular expression you have or

问题 Over the years I have slowly developed a regular expression that validates MOST email addresses correctly, assuming they don\'t use an IP address as the server part. I use it in several PHP programs, and it works most of the time. However, from time to time I get contacted by someone that is having trouble with a site that uses it, and I end up having to make some adjustment (most recently I realized that I wasn\'t allowing 4-character TLDs). What is the best regular expression you have or