whitespace: This value is expected to be between 0-100, and represents the probability that a whitespace character will be used instead of a visible character, when the expression allows it (e.g. when the expression contains a "." metacharacter). Higher means more whitespace. ...
+matches the previous token betweenoneandunlimitedtimes, as many times as possible, giving back as needed(greedy) \x00-\x7Fmatches a single character in the range between(index 0)and(index 127)(case insensitive) Global pattern flags
Your regular expression does not match the subject string.Try launching the debugger to find out why. Quick Reference Search reference All Tokens Common Tokens General Tokens Anchors Meta Sequences Quantifiers Group Constructs Character Classes Flags/Modifiers Substitution A single character of: a, ...