Regular Expressions 101

Explanation

Pro

1st Alternative(?<=[\.?!]\s|^)([a-z])

Positive Lookbehind(?<=[\.?!]\s|^)

1st Alternative[\.?!]\s

Character Class[\.?!]

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

\sany whitespace character

2nd Alternative^

^start of line

Group 1([a-z])

Character Class[a-z]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

2nd Alternative(\bi(?=\b|'))

Group 2(\bi(?=\b|'))

\ban ASCII word boundary

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

Positive Lookahead(?=\b|')

1st Alternative\b

\ban ASCII word boundary

2nd Alternative'

'the literal ' (39₁₀ / 47₈ / 27₁₆)

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?<=[\.?!]\s|^)([a-z])|(\bi(?=\b|'))

New

the quick brown fox jumped over the lazy dog. the dog did not like this! why would the fox jump over him? the dog did not understand.

why am i short? it's not lke i'm not eating or anything, i'm just short!

Extraction

the quick brown fox jumped over the lazy dog. the dog did not like this! why would the fox jump over him? the dog did not understand.

why am i short? it's not lke i'm not eating or anything, i'm just short!