syntax error in regexp pattern near index 4

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
syntax error in regexp pattern near index 4	1.13	0.1	7845	31	43
syntax	0.12	0.9	3267	98	6
error	0.2	0.1	7117	77	5
in	1.48	0.6	7849	18	2
regexp	0.84	0.2	5060	20	6
pattern	1.33	0.8	7231	87	7
near	1.25	0.2	4763	54	4
index	1.31	0.4	6094	86	5
4	1.69	0.5	5680	19	1

Keyword	CPC	PCC	Volume	Score
syntax error in regexp pattern near index 4	1.11	0.6	3007	57
syntax error in regexp pattern near index 1	0.03	0.2	5857	3
syntax error in regexp pattern near index 8	1.34	0.8	3316	64
syntax error in regexp pattern	1.45	0.7	4992	63
syntax error in regex pattern	1.48	0.4	2107	33
syntax error at or near regexp	1.03	0.5	5107	34
near index : syntax error	1.3	0.2	8300	23
incorrect syntax near index	0.38	0.3	2973	78
fix the syntax error inside this regex	0.33	0.3	6511	17
c# regex pattern syntax	0.3	0.3	7970	49
regex or in pattern	1.92	0.9	5660	34
regexp_index	1.72	0.7	8879	22
find the regex pattern	1.59	1	3554	7
c# regex index	0.45	0.4	6475	97
regex pattern starts with and ends with	1.85	0.2	8790	98
regex regex new regex pattern	0.81	0.9	5021	79