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programmerbrown/regular_expressions_list.md

Last active November 26, 2017 22:09
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Regular Expressions
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regular_expressions_list.md

Verify Username

Description

This regular expression matches an username with the following conditions:

  • it is between 8 to 30 characters
  • it contains only a through z, A through Z, 0 through 9, and underscore
  • it begins with an alphabetic character

Regular Expression:

/^[a-zA-Z](?!.*[?@!]).{7,29}$/igm

Link to RegExr.com example

Duplicate Words

Description

This regular expression matches duplicate words is not case-sensitive.

Regular Expression:

/\b([a-z]+)\b(\s\1\b)+/igm

Link to RegExr.com example

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