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<h1>Ruls</h1>
• The ? matches zero or one of the preceding group.
• The * matches zero or more of the preceding group.
• The + matches one or more of the preceding group.
• The {n} matches exactly n of the preceding group.
• The {n,} matches n or more of the preceding group.
• The {,m} matches 0 to m of the preceding group.
• The {n,m} matches at least n and at most m of the preceding group.
• {n,m}? or *? or +? performs a nongreedy match of the preceding group.
• ^spam means the string must begin with spam.
• spam$ means the string must end with spam.
• The . matches any character, except newline characters.
• \d, \w, and \s match a digit, word, or space character, respectively.
• \D, \W, and \S match anything except a digit, word, or space character, respectively.
• [abc] matches any character between the brackets (such as a, b, or c).
• [^abc] matches any character that isn’t between the brackets.
• dot-star  .* means anything except newline.

<h1>Samples</h1>
<a[^>]+href=["\'](.*?)["\']   Extract HTML href link.