Regular Expressions 101

All the errors detected are listed below, from left to right, as they appear in the pattern.

/ Delimiter must be escaped with `\`

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

/^(20|21)[0-9]{2}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])$/

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