Regular Expressions 101

^start of line

Group AC(?<AC>\d{3})

\d{3}a digit, repeated exactly 3 times

Group First(?<First>\d{3})

\d{3}a digit, repeated exactly 3 times

Group Last(?<Last>\d{4})

\d{4}a digit, repeated exactly 4 times

\sany whitespace character

Group EXT(?<EXT>(E?X?T?e?x?t?\.?\s?\d{1,7})?)

Group 5(E?X?T?e?x?t?\.?\s?\d{1,7})?

?repeats the group contents below at most once:

E?optionally matches the literal E (69₁₀ / 105₈ / 45₁₆) (case sensitive)

X?optionally matches the literal X (88₁₀ / 130₈ / 58₁₆) (case sensitive)

T?optionally matches the literal T (84₁₀ / 124₈ / 54₁₆) (case sensitive)

e?optionally matches the literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

x?optionally matches the literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

t?optionally matches the literal t (116₁₀ / 164₈ / 74₁₆) (case sensitive)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

\s?optionally matches any whitespace character

\d{1,7}a digit, repeated between 1 and 7 times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?<AC>\d{3})(?<First>\d{3})(?<Last>\d{4})\s(?<EXT>(E?X?T?e?x?t?\.?\s?\d{1,7})?)

Test String
New

5133521652 extension 1234
5133521652 Extension 1234
5133521652 extension 1234
5133521652 e 1234
5133521652 x 1234
5133521652 t 1234
5133521652 ex 1234
5133521652 ext 1234
5133521652 E 1234
5133521652 X 1234
5133521652 T 1234
5133521652 e. 1234
5133521652 X 1234
5133521652 Ext 1234
5133521652 EXT 1234
5133521652 EXT. 1234

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
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