regex allow string and whitespace code example

Example 1: whitespace regex

\s is the regex character for whitespace. It matches spaces, new lines, carriage returns, and tabs.

Example 2: regex optional whitespace characters

// Add a \s? if a space can be allowed.
// \s stands for white space
// ? says the preceding character may occur once or not occur.
// If more than one spaces are allowed and is optional, use \s*.
// * says preceding character can occur zero or more times.

'#<a href\s?="(.*?)" title\s?="(.*?)"><img alt\s?="(.*?)" src\s?="(.*?)"[\s*]width\s?="150"[\s*]height\s?="(.*?)"></a>#'