Playground

=> Start with word

• ^word

=> End with word

• word$

=> Match any of

• gr[io]s
• gris|gros

=> Match any letters/numbers

• [a-zA-Z0-9]

=> Refuse any number

• [^0-9]

=> Specify an optional letter/word 0 or 1

• a?

=> Specify an optional letter/word 0 or ++

• a*

=> Specify a mandatory letter/word

• a+
• [0-9]+

=> Specify range | ? === {0,1} | + === {1,} | * === {0,}

•  a{3,5}
•  a{3,}

=> Quantifiers

• *: 0 or more
• +: 1 or more
• ?: 0 or 1
• {3: Exactly 3
• {3,}: 3 or more
• {3,5}: 3, 4 or 5

=> Pattern Modifiers

• g: Global match
• i: Case-i­nse­nsitive
• m: Multi-line mode. Causes ^ and $ to also match the start/end of lines.
• s: Single-line mode. Causes . to match all, including line breaks.
• x: Allow comments and whitespace in pattern
• e: Evaluate replac­ement
• U: Ungreedy mode

=> Shortcuts

• \d: [0-9]
• \D: [^0-9]
• \w: [a-zA-Z0-9_]
• \W: [^a-zA-Z0-9_]
• \t: tab
• \n: newline
• \r: backspace
• \s: whitespace
• \S: nor \n \s \t
• .: everything
• frenchTelephoneNumber: ^0[1-68]([-. ]?[0-9]{2}){4}$
• email: ^[a-z0-9._-]+@[a-z0-9._-]{2,}\.[a-z]{2,4}$