Regular Expressions for Webform Validation

Here are some example regular expressions which might be useful in Webform Validation. Thanks to rbrownell.

"This"

^(?=.*?\bRehearsal\b).*$

Validates for the word Rehearsal.

"This or This or This"

^(?=.*?\b(Rehearsal|Matinee|Performance)\b).*$

Validates for at least one of the words Rehearsal, or Matinee, or Performance.

"This and This and This"

^(?=.*?\bRehearsal\b)(?=.*?\bMatinee\b)(?=.*?\bPerformance\b).*$

Validates only if all the words Rehearsal, Matinee, and Performance are present.

"This or This, This or This, and This"

^(?=.*?\b(Load In|Setup)\b)(?=.*?\b(Load Out|Teardown)\b)(?=.*?\bPerformance\b).*$

Validates only if either Load In or Setup is present, and Load Out or Teardown is present and only if Performance is present.

"Not This"

^((?!Matinee).)*$

Validates only if Matinee is not present.

"Not This or This or This"

^((?!Rehearsal|Matinee|Performance).)*$

Validates only if neither Rehearsal, nor Matinee, nor Performance are present.

"This, This or This, and This or This, but Not This or This

^(?=.*?\bPerformance\b)(?=.*?\b(Load In|Setup)\b)(?=.*?\b(Load Out|Teardown)\b)((?!Matinee|Rehearsal).)*$

Validates only if Performance, and Load In or Setup, and Load Out or Teardown is present but won't validate if Matinee or Rehearsal is present.