Regular Expressions 101

Pro

\ba Unicode word boundary

Character Class[rn]

rthe literal r (114₁₀ / 162₈ / 72₁₆) (case sensitive)

nthe literal n (110₁₀ / 156₈ / 6E₁₆) (case sensitive)

Positive Lookahead(?=[A-Z0-9 ])

Character Class[A-Z0-9 ]

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

the literal (32₁₀ / 40₈ / 20₁₆)

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.

25 tokens

\b[rn](?=[A-Z0-9 ])

New

r n r n r nFamily Medical History new r n  r n r r r  Roger nRobert n nDawson n49 nyears old , right shoulder

r n r n r nFamily Medical History new r n  r n r r r  Roger nRobert n nDawson n49 nyears old , right shoulder