regex101: PCRE (Legacy) Match Workspace

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

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

\sany whitespace character

Character Class[a-zA-Z]{3,4}

{3,4}matches between 3 and 4 characters from the set below:

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

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

Group 1(-\d)?

?repeats the group contents below at most once:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\da digit

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

Search reference

Regular Expression

b\d{4}\s[a-zA-Z]{3,4}(-\d)?

Test String
New

D      b1308 pspE; thiosulfate sulfurtransferase PspE   K03972 pspE; phage shock protein E
B  09193 Unclassified: signaling and cellular processes-6
C    99977 Transport
D      b2347 yfdC; inner membrane protein YfdC  K21990 yfdC; formate-nitrite transporter family protein
D      b3657 yicJ; putative xyloside transporter YicJ   K03292 TC.GPH; glycoside/pentoside/hexuronide:cation symporter, GPH family
D      b3876 yihO; putative sulfoquinovose transporter  K03292 TC.GPH; glycoside/pentoside/hexuronide:cation symporter, GPH family
D      b0361 insD-1; IS2 element protein    K07497 K07497; putative transposase
D      b1402 insD-2; IS2 insertion element protein InsB K07497 K07497; putative transposase

Regular Expression

Test StringNew

Test String
New